Ok, one problem at a time. You say that buying new speakers, did not solve your problem...what exactly was your problem?

If the wiring in the car is the problem, laying out new wires from the deck to the doors is not too tough. As for finding the wires, you just need to find generic wiring from a hardware store or from Home Depot or something. I believe that the factory size wiring is 20-22 gauge? SOMEONE CORRECT ME IF I AM WRONG. Crutchfield wont sell wire that small.

If you want an amp and a deck, there are plenty of places to get it from. It really sounds like you need to plan out your system and figure out what you want from it. A lot of places like Circuit City or Best Buy will have these combo deals.

If you want to use your friend's Bazooka tube, you will need a deck with a subwoofer preout, an amp that will power it, and all the wiring.

Give us more details about the tube, such as the model number so we can hlp you find an amp. And most importantly, what is your budget.