you will get what you want. MTX and Kenwood are good entry level brands that provide good quality for the money.
however, next time do a lot more research before you just go out and buy some stuff, you want to make sure all of the equipment your looking at will work out together (the amps will have enough power for the subs for example) because car audio salesmen don't give a shit about you and will sell you anything and tell you it is the best and will work out great. and next time install it yourself, its not hard at all.
good luck with it all. im sure you will be happy
<img src='http://img268.echo.cx/img268/1430/zkwsig23iq.jpg' border='0' alt='user posted image' />
1996 328is Black
Suspension: MB Motoring 18x8, Kuhmo Supra 225/35/18ZR
Audio:Eclipse CD3414 HU
Lighting: ZKW W/ DDE PLUS