Palestrina's Missa Ave Regina Caelorum. Works well for either feast or feria (just omit the Gloria.)

It's not especially designated for Eastertide, but I would give weighty consideration to Vaughan Williams' Mass in g-minor. Also, for solemnities of this importance, I tend to prefer the sober and ecclesiastical splendour of Monteverdi.

Orlando di Lasso' Missa super Surrexit Pastor Bonus, a 5.

Oops. I'm just now seeing you're asking about settings for the Easter, not Lent.

As you can tell, I didn't give up making hasty comments on online forums this year . . .

Does it have to be a cappella or can it have organ accompaniment?

You could always do polyphonic propers, (and if TLM the Asperges and Marian antiphons), and just do whichever Gregorian Ordinary sounds most Easter-y and up-lifting to you.

Missa Secunda - a cute ditty.
It has nothing near the gravitas appropriate for the most profound feast of the Christian year.

This is opportune. I have a new assistant coming on board and don't want to do Vierne. I'd prefer something accompanied since choir has a heavy load of a cappella works from Christmas through Lent.

Charles... my condolences to you on the slow death of your dreams (and the church's desire) to employ polyphony.

The polyphony can't be sung by the congregation so yes, it is out. I will be using the ICEL chants, so it could be much worse. At least it is not Mass of Creation.

learn 4 new pieces of polyphony a week, every week.

London Oratory, Or Westminster Cathedral?

if you have four excellent sight readers, polyphonic propers could be possible, but would it be desireable? not sure... I would prefer mostly chanted propers employing polyphony judiciously here and there.

Although its not an entire ordinary, there's a Gloria by Peter Latona which alternates chant with a polyphonic setting. It satisfies GIRM para. 53 (Gloria may be sung "by the people alternately with the choir . . .") with the chant parts and gives the choir some rather nice polyphony. Perhaps others can take up the challenge and compose / adapt other alternatim settings.

London Oratory, Or Westminster Cathedral?

How about St. Francis de Sales Oratory in St. Louis? I'm not kidding...

For a more straightforward accompanied Mass, how about the Mathias from the 1982 Hymnal? I can't find youtube of the real thing, but here is a grand version from St J the D.
https://www.youtube.com/watch?v=iH_lhkD2yg8

There are, perhaps, more well directed professional and semi professional Catholic choirs out there than are known to this forum.

Ya think? I suspect you are right about that. Some choirs and music programs don't get much attention outside their respective buildings.

MJO, on Easter itself, yes, I would agree. But the latter Sundays of Eastertide or the Sunday after the Ascension would be an appropriate place to sing the Hassler, which I like; it's in my parish's "go-to repertoire" for solemn festal Masses scheduled on shorter notice.

Amen (ah-men!) to what Steve just said.
Anglican chant is amazingly versatile and can be used to dress up many parts of the liturgy. There are thousands of Anglican chants that can be accessed from numerous books, and finding a nice one to compliment a psalm tone, or even to be used for an isolated antiphon, is a very easy task.

Though, as is, I think, common knowledge, I prefer the Gregorian tones to the more streamlined modern types, Anglican chant also works well with the modern tones.
If you sing psalms during communion, or at other places such as the offertory, etc., alternating psalm tone with Anglican chant makes for a very sensitive practice. You could train your congregation to sing the even numbered verses to psalm tones, whilst your choir sing the odd numbered ones to Anglican chant. (It is the centuries-old custom that in alternatim performance the odd psalm verses, or odd hymn stanzas, are performed by the choir or the organ, the even-numbered ones by all. The two exceptions to this rule are Gloria and Credo, the incipits [first lines] to which are sung by the celebrant or his designated substitute.)

Of course, at Walsingham, the entire congregation sing the mass psalm in directum to Anglican chant - and many of the people sing their appropriate SATB parts.

I think that everyone is aware, aren't they?, that the psalm, when sung responsorially, can have the people sing the responsory, with the verses being sung to Anglican chant or polyphony by the choir. There is nothing that requires the vv. to be sung only by a cantor. (And this is not meant to disparage talented cantors [the key word here being 'talented'].)

And, if you're looking for something interesting for Communion during Lent, I have the "Parce Domine" antiphon paired with a single chant by John Blow (public domain) using 2 verses at a time from Psalm 51 in Latin.

Steve, if you don't mind, that Parce sounds fun...please post!

P.S. I always give the "Parce domine" antiphon to the congregation to join in. Here is a JPG. (If you prefer a TIF for insertion in a document, I'll have to send that in an email.)

Note to moderator: Is there a way to set up this blog to accept TIF graphics files?