To hell with the weight, a few extra pounds on the street are not going to slow you down all that much. 8)

I suggest you replace the Headunit with the best that you can afford (the better it is, the better your sound will be), also upgrade the 6.5s with what you can afford and run them off a 4 channel amp.
And for subs... I have 2 Fosgate 12s in a sealed box that are powered by a Fosagte 500a2 amp in 2ohm.

When I do go to the track or strip I just take out the sub box and go.

I apperciate Music a lot and besides the stuff I already had from my last car :wink: