Where to take a shot at 30/60 or 50/100?

[Roswell]

Since last November, I have worked my way up from 5/10 short to 15/30 full on Party. I have pretty good results at all levels. I prefer to play shorthanded but I'll play full as well.

I was considering taking a shot at 30/60 or 50/100 limit holdem. I'm willing to risk about $4000 on this venture. Where can I find the most donks playing these limits on the internet? Right now I am leaning towards UltimateBet or Prima.

I realize the higher stakes players who play these games may be reluctant to give out this info, but I thought it couldn't hurt to ask.