You might also check out the Kragen HID offroad lights, they come in 4" or 7"... You can find the 7"'s on sale for 70 bucks a piece sometimes. I believe they're 5000k temp, too.
Thats basically what I am thinking. I wonder how hard it is to fit the HID's in there?:shrug:ill be doing the same thing soon. I'm gonna go with the hella500 and customize them with some ddm 35w 6k and install them behind my grill with a relay to turn them on/off from a switch.