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First of all, there are no 2 piece cranks lol. But yea if your going to get new cranks i recommend you get profile, BUT I'm guessing since you had 1 piece cranks that it is an american BB so you'll need a new one of those and for cranks I recommend you get Tree Spine Drive.Total it would cost you about 300ish. But you could always go cheaper. Those are just the top of the line parts.

if i were you i would get a 3 piece crank with a 25 tooth sprocet in the front and a 9 in the back

well man u got 2 options mirraco is really up to date on there parts haro has been around longer nmirraco has dave mirra behind the wheel and he kno's what he's doing if it were me buyin a bike i would go with mirra co