ok thx Mazier, but I checked out your claims. The P5K and PK5C both support up to 8 gigs DDR2, and the P5KC has the additional 4 GB for DDR3. So overall, the P5KC is basically the P5K w/ DDR3 support. Otherwise, its exactly the same. From what i can tell, the only difference the PK5-e and PK5-wifi have from the P5Kc is extra SATAs, USB, etc. which is not necessary for me.
Also, I like the copper heatsinks around the chipsets over the aluminum ones on the P5K.