This thread has been very helpful as the OP has a very close setup to what have and great testing+ feedback.

My main problem is that with a Q6600 at 3.6 (1.45V in BIOS) and an EVGA GTX280 at 756/1566/2600 my CPU temps can get to 70C under prime95 small ffts load as measured by real temp.

For the GPU 58C seems to about the max it will get to while running furmark stability test, all other games/benchmarks don't really go above 52C.

Compared to the OP these do seem quite higher even taking into account a slightly higher ambient temperature.

What I am currently contemplating is the current swiftech MCR320 rad I have may not be enough for my system. I am wondering by upgrading to a PA120.3 would this net me at least about 4-5C cooler temperatures or more to justify the cost of the rad. I understand two loops do provide better cooling but I would like to stick to one loop also.

Current WC system:

Swiftech MCR320 Raditor
Swiftech MCP-655 Pump
EK Supreme Universal GPU block
Swiftech GTZ CPU Block
Swiftech MCRES Micro Reservoir
1/2" tubing
feser one Cooling liquid
BP Compression Fittings

I also am in the process of upgrading to a EVGA X58 Classified MOBO when it is released and 920 i7 processor, and from what I hear the i7's put out a lot of heat, although I do not know if it would be more or less heat then what my current Q6600, any info on this would be helpful.