ive done quite a bit of the pieces you all have mentioned, so i dont think i have to list them over again. ive sung all of my life and in choirs for over 10 years (and considering im 18, thats a long time...)
one of my fav pieces has to be "sing me to heaven" just because we pulled it off so well in our final concert. it was absolutely spine-chilling. and i usually sing in treble choirs, so any SATB piece is fun to me. i have a link so that you can listen to it if youd like, but its another group... we did it 10x better... and im not BSing... its a gorgeous piece.
listen to it!
http://www.dunstanhouse.com/mp3/9101.mp3