Hey man, I got a 98 regular cab too and it's hard as you know to have much of a system in there. I ended up having to build my boxes custom for te size of the seats and work with what space I have. I got two Punch Stage 2 12s and an old Pioneer 760 that i paid twenty bucks for by the way, and I have a system that won't let my rearview stay up it falls to the point I am looking at my seats. But for the cash a would go with like two Dual Voice coil Stage 2 10s where you would still have plenty of room and I would get me like a Punch 1500 or so two channel amp and bridge it out and you will have plenty of bump. The only problem I have had with it in my truck is tha the sound don't carry out like it should. But if you got anymore ?s hit me up man.