50°C? That's a tad bit high for anything not under load with 2100+... I have a 2000+ myself, and it's being cooled by a loud Heatsink/fan combo. It's a ThermalTake Volcano 9+ with CoolMOD (although only two blue LED lights works on it, none of the red), but that doesn't matter since I have a blue CCL in my system. The Volcano 9+ retails for around $30 USD.
I'll enclose a picture of the fan itself (it was running when I took the picture with my digital camera several months ago... it might appear as if it wasn't running at all in the picture. It can go up to 5200 RPM, which would make it a noisy cooler.
YOu could go for the ThermalTake Volcano 7+ if you wanted to... those would bring the CPU down to 45°C at load (that's much better than what you're experiencing right now).
Just a piece of my opinion... a piece of advice, and hopefully, I'll be able to buy the 2800+ with the new Barton Core in several months when the prices go down after the Hammer hits the market.