I've always been happy with a Boss CE2 or CE3. My ancient Electro-Harmoix Clone Theory continues to serve me well, also; never tried one of the Small Clones but I'd imagine they're similar. If you happen to hit the lottery, though, my vote would be to try a Fulltone Choralflange --- shweet!
cjpm
P.S.: BTW if you do hit the lottery and decide you don't like the Choralflange, just send it along to me......