wats the best pedal for
wah wah?
reverb delay chorus

should i just get a combo pedal for this?
If you want the best sounds, get separate pedals. Also, you should state music styles you'd like to play and your budget.
If you're looking to use pedals through your Roland Cube 30, I'd really suggest trying before buying.

Most solid state amps don't take real well to pedals, and more often than not sound pretty bad. My own suggestion would be to upgrade your amp to a tube amp.

If you're dead set on getting pedals though, like I said, try before you buy so you're not disappointed.
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