Party through
PSO is definitely a top choice.
I found Full Tilt through
PSO really good too. Not for the basic 100% bonus which clears pretty slowly at low limits but for the
PSO points which can then be turned into Party Poker/Absolute vouchers. I deposited $150 and played until the first $15 of the bonus was released which coincides with the point at which you get 9000
PSO points (equivalent to $90).
Pokerroom was a fair bit slower to clear but had 500 custom/stock NJs as an option in May so was worthwhile for me. May still be worth it for the 12,000
PSO points.
If you've never played a Prima network site there's a pretty sweet (if not especially large) Grand Bay Poker bonus: It's a $30 bonus on $30 deposit and If you get "referred" by a friend then an extra $30 comes in - all in 100 raked hands. It does sometimes require some emails to their support to get it all credited, though, and the refer a friend bonus has been less reliable than the above (see 2+2 threads on the topic if your life is too exciting at the moment).
Really, there's lots out there. But in terms of value, service and reliability
PSO are hard to beat.
Regards,
David.