NOT Paradise Poker.
Prima sites - Golden Riviera offers $20 bonus for a $50 deposit every weekend. Right now it looks like Gaming Club is also offering $100 on a $200 deposit. I know that GR's can be cleared at $50 NL, and I think GC's can as well although I haven't done it yet. Both should clear at $10-$12 per hour if you can 4-table $50 NL. The play at the Prima $50s was too hard for me at first, but now I crush the tables pretty easily. I'm thinking it was a psychological block as much as anything the first time I played there.
Bodog - the play is TERRIBLE at the $50s, and they have a "bottomless" bonus, which basically means deposit once or twice and they won't complain.
If you have a decent sized bankroll, I would recommend you put ALL of it in Bodog and you can get 10% bonus on it. If you deposit in smaller chunks they get mad. Anyway, the bonus clears at about $8 per hour at the $50 NL tables if you can 3-table (that's the most tables Bodog allows).
Party has a reload going right now too at $50 NL.
Sheesh, you got a ton of options.