Plenty of sites around. I suggest that you try the big ones.
1) check-out pokerpulse.com - details the traffic of most sites worth playing at.
2) read the content listed in this forum.
3) see below (my comments from another post).
paradise poker - software is good
pokerstars - best (type, limits) tourneys online
party poker - best (softest) games online, best game selection, most one table tourneys available at any given time
wsex - lost its edge but had the highest limits online, most flexible manager in regard to table creation/special requests
4) support the rx and give bigbet a try. not my taste but some folks like it.
FYI, I spend most of my online poker playing time at party poker. Pretty interesting distraction until football season starts.