Just me, but I'd muffler mod the 260 and keep cutting firewood with it for a very long time and get something used and BIG for milling.
Like the idea, BlackCatBone, and as Tzed250 said, maybe you (RustyB) ought to think about the 3 saw plan.
Thanks! I did the muffler mod long ago though...along w/ a little choke mod and an adjustable 026 carb. I like the saw fine in wood 8" and less but I have been turning down a lot (for me any way) of free wood simply because the saw feels underpowered in the 12-18" diameter stuff.
Otherwise, I like your idea and it's one that I pondered a while back and then again after I posted. It's not like I'm a big time cutter or anything so I wouldn't need a larger firewood saw that many times per year.
I'd have to agree with grandpa tractor about the 7900 for the reasons he listed.
Vibration? Go 372xp or 7900, in that order.
Horsepower? Go 7900 or 460, in that order.
Air Filtration? 372xp, then the 7900.
Warranty? Go 7900 (1 year regardless); 372 - 90 days for professional use, 1 year homeowner use. 460 - 90 days, period.
However, you may want a used 395xp or 660. I've not run a 395xp, but I hear the vibration is less than the 660. I personally think (know) the vibration on my two 460s was greater than my 660.
The 395 and 660 will obviously be better and faster for milling, but I think the others will work too, just not as fast. And if you want to sling the saws around from time-to-time, they are a little more versatile and less tiring.
So, financially speaking, buying used would seem to make the most sense. But, knowing how some people can trash mechanical things like this, I'd be very nervous about buying used....unless the saw had few hours on it AND I knew the person had a history of taking care of his equipment. But, where do I find this saw and person? Any takers here on AS??
Hey CPR, this next bit is for you too.
I know this will seem self-serving, but you asked. I have a newsed 372xp with a warranty from the Husky dealer - he will transfer it. I just purchased the saw on March 07, 2008 and it has zero hours on it. It comes complete with everything as you would buy it new from a dealer, but at a reduced price. PM if you are interested.
Just a thought or two...or three...or...