Save your money, take your time and install a decent setup.
I was running 6x9s on a stealthed MDF shelf. With a JBL sub in the boot running on an Orion amp. The ONLY reason I'm doing this is the 6x9s were free, they cost £80 new back in the day. And frankly, they're crap. No real weight to say they have decent punch, and no clarity or detail to make them anything but muffled. The sub took care of all the mid-range that the 6x9s did and more, I didn't even hear them.
Just 'dropping' a sub in the boot isn't quite as easy as people think by the way. It involves running (fused) power cable from the battery under the bonnet, through the car and into the boot and earthing somewhere in there (usually on one of the nuts for the suspension struts) and running RCA leads from the HU to the boot down the other side.
If you want to mount components you may need to fabricate/buy replacement mounts if you want to fit anything larget than the standard size.
Fitting an aftermarket head unit will make a BIG difference in sound quality, and will give you a better idea of what you need to upgrade next. A smaller, livlier sub may be able to take care of a lot of the rage you currently lack, at the expensve of a less organ-devistating hit at the bottom end.
Avoid active subs. They suck. Almost as hard as 6x9s
I usually got for Alpine HUs. Pioneer and Kenwood are also good. And blaupunkt, whilst not at the previous prestige, can offer good value for money.
Ant
