Any advice? I want to keep the head unit stock if possible, and I'm not planning on too much. An amp, a sub (poss. two if i can get a good deal) and just replace the stock speakers with Kappas.

I'm not sure what the head unit is capable of, but I'm wondering if anyone here knows. I kind of want to know what I'm working with before I start messing around.

Also, as for head units, I've had my eye on the Pioneer DEP-H6400, but do any of you have a better choice in that price range? (I know the whole OEL screen is just for looks, but it looks pretty damn nice.)

Thanks!