they 2500s arent bad, havent heard 1 in a daily install but buddy of mine has 4 15s in a wall, it sounded ok, better than an MT, but i'd have 2 go wit the CVRs out of those.
Dont get Audiobahn thats all i can say, ive had two cvr 12s and they sounded pretty crisp and clean and hit lows real hard but ive never heard the other sub.