I posted this in a recent SNG bonus-clearing thread:
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All the information below is taken from BonusWhores.com. Check there for more details, and I'd also recommend registering to the sites from the affiliate links on the BW page since some of them require it. BC = bonus code, d = deposit needed for the maximum bonus. NO MAX means it's X% of whatever you deposit. For instance if you deposit $1000 in BoDog, 10% of that is $100, so your bonus is $100.
100% Tourney Fee returned:
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BetHoldEm: 50% up to $250 (d - $500)
Bodog: 10% up to X (NO MAX!)
Doyle's Room: 35% up to $150 (d - $400)
Hollywood Poker: 100% up to $200 (bc - BW200)
PokerRoom: 30% up to $200 (d - $700)
70%+ Tourney Fee returned:
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Eurobet: 100% up to $50 (bc - CLUBS)
Holdem signup: 150% up to $150
Holdem reload: 20% up to $100 (bc - EVENT, d - $500)
Tiger Gaming: 100% up to X (NO MAX!)
Tropical Poker: 100% up to $1000 (bc - MATCH100)
Victor Chandler: 60% up to $600 (bc - VC60, d - $1000)
Victor returns about 83%, the rest return about 70-75%.
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I've only played the competition on BoDog, PokerRoom, and Doyle's Room out of those.
BoDog is the easiest, but has a pretty small bonus. You have to deposit more than $1000 to get any decent sized bonus.
Doyle's Room also has easy competition, but the $20+ SNGs take forever to fill (the < $16 SNGs fill within a minute though).
I'm not sure how the play differs with 5-6 max SNGs though.