It would feel like I was in heaven if I could be in a choir in a good conservative church that sang pieces like the Palestrina. The acapella choir I was in in college sang pieces like this. As well as by more modern composers like Barber and others.
We've sung some John Tavener ("The Lamb"), Faure' (Requiem and the "Cantique de Jean Racine"), Harold Darke ("In the bleak midwinter"), a bunch of Anglican stuff (C.V. Stanford, Elgar, Vaughan Williams, etc.) Our choirmaster also composes (he composed some music for my daughter's wedding. It was pretty cool. Modern but chant-based, mostly.)
We can use anybody who can manage anything near the tenor range - most of our basses are the basso-profundo type and they complain bitterly when they have to sing baritone. I sometimes wind up singing tenor in a pinch, but I don't like to because it contracts my upper range if I do it too much (I'm a true contralto with a range from about D3 to (sometimes) F5.)