If it's just for the bonus, I don't think it's worth it for me to start running around looking for casinos that will offer me a bonus, as that can lead me to even fall into the hands of some scam casinos.
 
It's easy to see casinos that will promise you a large bonus even on the instant of registration, but they might make the wager requirement a living hell for the gambler, or if you eventually meet the target, you won't still be allowed to withdraw.