Thanks guys. So you would shy away from the smaller "home owner" saws, i.e. echo or solo 636. I guess I would certainly want a 3/8" chain.
Oakfall
Well if you want to run standard 3/8" chain you will want something at least 50cc. My trail saw is a Jonsered 2152 (Husky 353 equivalent). It is super reliable, relatively inexpensive, easy on gas and light enough to haul through the woods on your back. The 353 or 346XP would be a good choice. If you don't mind moving down to .325 chain (my 2152 runs .325) that would open up a whole new range. The Husky 435 and Stihl 211 are supposed to be real good saws.
I think for a trail saw the "homeowner" category of saws would be fine. Just don't buy a cheap poulan or homelite from a box store or you will be 2 miles into a trail without a saw.
Just remember, the bigger the saw the more fuel it will suck and the more you have to carry. If you won't be cutting anything bigger than 30", stick with the 16" bar.
If I had to replace mine, the ideal saw would be the 346XP followed by the 353 again, then the 440 or 435. The 357 is a super nice saw but compared to smaller saws it sucks the fuel.
Good luck and stay safe!