for the second time i never had a e2100 lol. i did have a e4300. and you answered your own question. i bought it cause i didn't like the intel setup i had.
also the e6600 is a great no questions asked, no regrets cpu, i believe it got CPU of the month on newegg like 3 or 4 times so if you go with that then good choice, you won't be dissapointed. but on the other hand i believe in terms of total percentage overclock at the lowest cost the e2160 takes the cake.