Noble has a 100% first time deposit bonus I belive. We must earn 100 crowns(like party points) to get the bonus though. I went through my $50 deposit already and I think I only earned 7 crowns so far. I don't think we earn crowns for freerolls.
PartyPoker offers 100 partypoints if you deposit 100 dollars. That would get you into a 500 dallar freeroll, yet it registers up to 2500 players. 500 players takes long enough for me.