Kits aren't very popular. Watercooling is a DIY sort of thing, you have to test, assemble and tweak even the best kits so most people just order their stuff seperatly. Its generally no more expensive and you get exactly what you need from a setup and no crap.
For example my new setup is:
A Maze2 (1/2inch fittings) from
www.dangerden.com
An Eheim 1250 pump also from dangerden
A BigMama type cooler from Dtekcustoms.com (cheaper then the orginal Big Mama and comes with 1/2inch stock instead of 3/8)
Eheim pumps are frikin expensive, a Danner MagDrive is 98% as good for mway less. But I wanted the absolute quietest I could buy, so I took the Eheim.
The BigMama is probably the best you can get if it fits in your case, but the Dtek unit came out $12 less then the 1/2 inch BigMama and they could ship same day, which
www.overclock-watercool.com couldn't.
Finally the Maze2 was a no brainer. I have yet to see it lose to any other cooler out there and it comes with a kick-ass clip built in. Not to mention 1/2 inch fittings at no extra cost.
Cost: $164 before shipping and hoses and clamps (dirt cheap at local Aces hardware). I got all Copper parts (mixing metals is a bad idea, even with WaterWetter), all 1/2 inch fittings to I get a close to the ~270GPH my pump is rated for and an all round quiet system.