Supposedly, the max temp is around 100-120C, but that's more like the critical temp when things go funky. Ask any gamer though and they get very uncomfortable around 90C. Also, that's core temp, typically memory or VRMs go before that, but they don't have any temp monitors.
Useful, but limited to 2 amps. That's enough for one of your fans.
Aquacomputer Aquaero 5 LT - that is fully programmable, complete with USB interface and can be used for water cooling too. Each fan header can support 1.65 amps for a total of 5 amps across 4 headers. You can buy additional header mounts for up to 10 fans I think. This is a new release, so can't say much. More for water cooling, but if you decide to go that route in the future, it might be worth it (or even for Psi).
Lamptron FC Touch - Which we've reviewed.
30 Watts per channel (so over 2 amps), up to 6 channels. (120 Watts total). Ask Optix for more details if you need them (he's the one that reviewed it).
I added my 280 to my 360 and now only run my 280 with 140s on it (a pair in pull) and my 360 has 2 200mm fans above it in pull. I may add some CM R4s on the insides since they are dang quiet and then my loop would be really chilly (vs air) and still very quiet.
I had been running 2 deltas on the 360 rad at 2k rpm moving a large amount of air with ridiculous static pressure. (2k is a low as they could go and they were really loud even then) I call them fingerslicers 4k rpm at full speed, it is not fun to touch one at that speed......
Grab this, Arctic Cooling is AWESOME: Newegg Link My 5750 used a much smaller AC cooler (made for HIS) and it was awesome. Stayed cool enough to clock it to the wall no problem.