Mine wouldn't push 175fsb or so until I upped Vcore to 1.725 which caused too much added heat, so then I ordered a ThermalTake Volcano 12+ and installed it with some AS5. The combo dropped my temps dramatically and I am now able to run 200x11 or 2.2Ghz stable, much past that and the temps start climbing again and prime95 fails. I have heard of people getting 2.3 or so out of them but I think that's gotta be the best of the batch!
Malladine - Is your cpu locked? if so when raising your FSB, your Nbridge may be getting too hot, esp. if you have onboard video. You might try a cooling solution for your Nbridge or if it's unlocked, lower your multiplier until you find your highest stable FSB, then start bringing the multiplier back up until your CPU temps are about where you want them, then test stability. Good luck!
OP for around $200 (with cpu, mb & fans and such) I upgraded my proc/mb from a 1.53ghz amd 1800+ with 133fsb to a 2.2ghz 2500+ with a 200fsb. It's been many months now and beleive me the difference is phenomonal! I would instead of the 2.17 Ghz 2700+ go for the 2600+ mobile from newegg, it's only $95 shipped and runs cooler/OCs better and probably won't be multiplier locked. Your choice though...