betfair's good.
wil hil's solid but If they 've cut your bets to 20 euros a game it's a solid bonzai.
but yeah, shop around, that's the way to go, dodgy outs are not that hard to spot besides the crap or two flashy interface, and the spam mails you'll get, if you keep checking out some place and they almost always offer 10% on top of the average competition that's always a no no sign.