you'll need a guitar with humbucker, that means to go away from the stratocaster single coil pickups type..
Don't bother yourself with the would type & that stuff now, i dont think it's going to be important for you..
Anyway, the tremolo does't affect the tone of the guitar..
the tremolo arm (bar) is the thing attached to some guitar at the bridge that you can shake to make exaggarated vibrato..
A standard tremolo (mostly found in stratocasters) has some limits that you you can't push or pull very far, and usualy goes out of tune if not used by an expert guitarist who knows how to strech his strings well..
A 'Floyd Rose' tremolo has a floating type bridge and a locking system at the nut, so that you can push as far as the bar goes to the neck, or pull till you break your strings...
My recomendation from the list you wrote , buy the 'B.C. Rich' because most of the B.C. Rich's are metal style guitars..
aslo think of epiphone since they have humbuckers too
