I don't think anything under under a 2400+ is a Barton, so would avoid the 2200-M.
Anyway, be interesting to see if the *even lower* voltage 2400+ overclocks as well, or if there are any boards that will allow you to run at 1.35V 😉
Very pleased with my $99 45w 2600+ @ 2.51GHz on air (about 38c load, 1.65V)
Edit: in this case it looks likely that the 2200+ is an underclocked 2400+ anyway (same stepping, and it says 512K Barton) in fact people have speculated that the 45w Mobiles 24/25/2600+ are all the same chip, with different quality controls, maybe the 35w 22/2400+ are the same....?