Suggestions on speakers

I have a 2003 Ford Focus SE 4 door with the Blaupunkt single disc CD player without the factory sub. I was looking into getting some new door speakers and was wondering if anyone had suggestions. I am willing to spend about 150 a pair. It has 6x8's right now but also holds 5x7 or 5 1/4's as far as I know. Later on down the road I was thinking about getting a sub too. I was looking at the Kappa Perfect 12.1 with the JBL BP 1200.1. I haven't looked too long yet, but does anyone happen to know if the Kappa Perfect's can come in DVC? I would hate to have that much amp and not be able to use it all but I want the ability to add another sub if I feel the need.

   Thanks,

           ~Brandon

Funny you ask.  Over the weekend i replaced the crappy factory ford speakers in my sister-in-law's 2001 focus 4 dr SE with infinity's Kappa 572.5 CF.  I used the stock ford cd player (it took her 2 month to figure that out so theres no way an aftermarket head unit would have helped) into a Peripheral Electronics p554A LOC which is going into a Crunch Noxx P80.4 to power em.  There a little more pricey then you 150 limit but worth the extra money.

I was looking online at Crutchfield and came across the Poineer TS-A6880R, 4-way 6x8's. Has anyone heard these? Would they be worth buying? Or even the Kappa 572.5 CF's, anyone have any opinions about these? Any other suggestions? Question about the amp though... the 1200.1 will put out 600x1 @ 4 ohms. The kappa perfects can handle up to 350 RMS and 1400 peak (suggested at least), so why wouldn't it work? Thanks for the suggestions so far.

~Brandon