Why no mention of Husqvarna?
A 026 stihl is always a worthy saw, 346xp, 353, or even a 350 husqvarna are excellent 50cc class saws.
While I agree the Echo CS590 is an excellent value saw, given the OP's description of use & assuming he's looking for a 1 saw plan (although this might change if he continues to hang around here)... I would think a saw in the ~50cc range would be best suited.
My money would probably go on the Echo CS490 if buying new, otherwise one of the husky 3 series ~50cc saws as Sean suggested.
The redundancy of a 2 saw plan is attractive if funds permit... I'd then be looking for a ~40cc & a ~60cc Saw for what you describe