If this will be your only saw with anything other than just limbing, I would skip both the 260 and 261 and step up to a 361 or 362.
I bought my 260 some time ago with the intentions of it being my "one and only saw". First time I tried to flush off a couple 15" stumps with the 18" bar I went and bought a 460. The 260 wouldn't even stand the weight of a 14" long log on top of the bar without dogging off, and the 460 doesn't notice (yes, I know other ways to flush stumps and get by with the small saw - but the point is the small saw sucks compared to the 460). The 460 has become my all-day use saw for anything whatsoever with 20" bar most of the time, unless it's strictly light limbing then I'll pull out the 260. But that may be too big for you - depends on a lot of factors.
If you're going to spend much time at all cutting above 12-15" and are dead set on one saw, are physically able, etc. - IMO, step up above the 261 or you run a good chance of disappointment.