I have a Alpine 7893, and some Infinity kappa 3way 6x9s. I am going to put some Iroc wheels on ebay for more stereo money. I have $100 and hope to get $250-$300 for the wheels. So what sould I get for $350-$400. Kick panels and components for the front or a amp or subs or what? Any suggestions will be appreciated.

maybe get some front speakers and an amp/sub combo.... search like a trusted online place to buy eletronics for prices..

Follow my steps...
2- 12" inch infinity kappa perfects
MTX 6500 class D
Hits so hard, knocked my rear view mirror of and radar off window too many times to count

I recomend upgading your front speakers and getting a sub/amp combo. The size and amount of subs is up to you and how much bass you want. I have been using and recomending kenwood PS400 amp, available on ebay, subs are a personal choice, but two 12" or 3 10" will pound on that amp and give tight clean bass. I was able to run 4 10" subs off that amp with no problems at all. I was never able to put my rearview mirror on though, wouldn't stay for more than 5 min.