Before an optimal loop can be suggested, you should ask your self a couple questions.
-Do you want the loop mounted internally/externally?
-Are you willing to cut into/modify your case?
-Do you want performance, silence, or a mix?
-How much are you willing to spend?
If you wanted internally, I'd say remove your bottom 5 1/4" drive bay and put a thermochil pa 160 on that fan, and then have either a thermochil pa 120.1 or a HW labs Black ice steath gt mounted on your exhaust 120mm fan.
If you don't mind an externally mounted radiator, use something like a swiftech radbox to hang a 120mm x 2 radiator like a swiftech MCR220, or a thermochil 120.2.
For both set ups use your choice of water block, though I suggest something like a d-tek fusion, or a swiftech apogee gt(x) for your cpu, and then either a full cover water block like those offered by swiftech, EK, and Danger Den, or a core only block like an MCW60 with ram sinks. I personally use 7/16" masterkleer tubing because it fits snuggly over barbed fittings with a lower chance of leaking and it's dirt cheap at $0.50-0.75 a foot compared to the $2.00 per foot cost of tygon tubing.
Since the P182 is kind or small (for water cooling purposes) on the inside I'd suggest using a lian ddc/swiftech mcp350/355 pump with a modified top like the one found here:
http://www.petrastechshop.com/laddcwpeddto.html Another pump to consider is the liang d5/swiftech mcp655 which is a little cheaper, and a little larger with less maximum head pressure than the ddc pumps.
If all this has your thoroughly confused check out some of the water cooled p180's over at xtremesystems like the one in this thread:
http://www.xtremesystems.org/forums/showthread.php?t=34877&page=177
*edited to address the north bridge which I skipped* I almost never water cool the northbridge, but if you do I suggest looking at low resistance blocks like a swiftech mcw30 or an EK chipset block.
happy cooling
-CB
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