what pricerange? you can get a good one for a little over $100 using these parts:
Pump: Magdrive 3 $40
CPU block: Swiftech MCW6002 $40
Single Heatercore (or double if you have the room) - $20
Then all you need is one or two 120mm fans, a shroud (you can make it yourself), some tubing (clearflex60 or masterkleer), hose clamps (can be bought at a hardware store for cheap), a T-line (also at hardware store, about $1), and distilled water and antifreeze. You could probly get all that for $20-30, so that comes out to about $120-130 for a pretty damn good setup. Also, if you get the mag 3, make sure you put some sealant around the barbs, as it has a tendency to leak over time. Other than that its an excellent pump, and some quick preventive epoxy application will rid you of worries.