getting a wad of cash tomorrw

my system so far-pioneer head, 6inch mids,kicker comp vr sub,,blaupunkt 200w amp....

choices i have: coustic xm3e crossover, friend has a brand new one for about 50 bucks
audiocontrol crossover/line driver/etc/etc-same price, my installer has it but he says he 'cant tune it properly' but some guy he knows with a meter or sum'n can, fgairly new, is this too complicated to use for someone like me?
or i could change the amp, but i figure crossovers would help with the sound?
mb quart 4inches in dash, vteg told me 50rms but i want to use an amp, ima try the 100rms from the blaupunkt and turn down the gains or run 2 from one channel
gonna try out a 600'w' crunch on my subok, so if i get a nice crossover, some nice mids up front, 2 amps what next? im thinking of ditching the toyota speakers and going with the simple 6x9 in the hatch cover to keep it simple...

btw: my friend has a COBY dvd/cd player, will this play my sound good enough?

hmm, sort of confusing....
i just wanna keep it as least confusing as possible....
2 fours n the front, mids in back and sub in trunk, but want them to sound aas good as possible

 

OR should i use some of the money and upgrade the sub/box?its in a ported bass tube that i think isn't getting out all the bass i want...
i could upgrade to a nice fosgate punch and put it in a killer box
i want weght savings so one sub is a must

oh yeah, i also have in the choices of getting some door panels my friend has with kick panels...2 6.5's in each door, i would probably use pioneer mids or infinity if i get lucky
my friend has kicks in his starlet with fosgate 6's and powered nicely they play real nice!
should i focus on some killer 6.5's for the doors? i mean, 4 of them up front i shouldf be able to get some bass to make up for the one sub

 

I would go with the box. have pretty much everything and I'm changing my sub box to get the sound I want. If you wait a week or two I'll let you know if that's the key!

 

its NOT the tube that is the problem, we put it in my friends car with a ppi 400 amp and fed it 2channelk, the bass was amazing! i just need a better amp

 

well, im spending my money on spraying over my car so...im stuck with my current set up, kicker cvr, pioneer head,blaupunkt 200w amp, toyota 6's and mb quart 4inch in dash...al out of the car to be installed after spray job