To me nexgens suck but if you have to get them this is the best deal in town right now.
http://www.overstock.com/cgi-bin/d2....ROD_ID=1517597
But there are a few other good chips out there in your range right now.
I like faux clays and at .045 each they are a great chip, I personaly have about 7,000 or them for large tourneys.