well ive never owned 1 but i'd guess 3.0ghz + will be possible since @ 2.4 it only has a 45w tdp, let us kno wot u get.
if u get 3.0ghz or more then it would be reasonable to match it with a hd3850/8800gs i think, probabarly would even be a decent match for some faster cards if you get the clocks to 3.0ghz or faster.
my 65w athlon x2 5200+ runs at 2.6ghz by default and gets to 3.2 at max overclock. since your cpu is a stripped down version of mine, id guess you'd get urs faster than 3.2ghz if your mobo allows.
the hsf that came with my proc was crap.... i could get to 3.2 ghz with it but at full load there was tonnes of noise and cpu temps rose to ~70.c so i quickly shut my system down. at stock speeds the cooler keeps everything below 50.c in hot weather but is still noisy under load... remember this is the cooler for a 65w cpu, yours is 45w cpu so ur cooler may be worse than this....
good luck and let us know what you manage