I think it depends on your skill level.
How long have you played?
How good are you?
If you fall into the novice category (which I suspect is the proper place), I'd be looking to be in the .50 cent range. I think you will find some moderately decent play at 1.00, I might stay away from that until I tested the waters thoroughly at .50 cent.
I wouldn't be in a rush to deposit more money, I'd be trying to find what level I could beat. I think 50.00 is plenty. You should be trying to clear the bonus., not depositing more.
Playing .50 or less, double your bankroll, clear the bonus, and only then think about a move up to 1.00.