If you have a predilection for something, you have a preference for it.
An eclectic assortment of things or people comes from many varied sources; additionally, it usually includes the best of those sources.
The elite members of a society are those at the top or those who are the very best.
A collection is a gathering or bringing together of things, such as stamps or football cards.
When you select something, you choose it or pick it out from a group of several other things.
Differentiated vocabulary for your students is just a click away.