what's the best cpu heatsink / fan

Hi, i'm currently running on 52 C and that's making my room hot. It might be a wrong reading, but since i'm a newbie i would never know. i'm using a stock 2400+ hsf right now and i think it should be sufficient for an 1800+ at stock speeds, but apparently i'm wrong. Can anyone suggest a good HSF for my 1800+ and my 2400+(unlocked).

Thank You, and I hate computers.

I think u answered your own question "Stock" is bad get a new HS
I have the sp-97 with the 92mm tornado fan . Works for me =)