My pick would be the MS250.
I have a 345 which is the same as the 445 I'm pretty sure and I like it a lot, but for what I do, I clean it a whole lot and don't care for the air filter or clutch (would like an inboard clutch). Both are light and have good power for limbing or falling etc... My 345 is a beast that has taken some serious abuse. The 345 has the screws to get at the air filter but I don't really care for Husq.'s quick release catches either (like on the xp saws). I really love the stihl screw on type like the 660. The gas and oil caps are a pain too since I'm a chronic over-tightener of things and always end up bending twigs in half to get enough leverage to open them back up. My back went out throwing wheel drums from a belly dump trailer into a loader bucket, so now if I bend over too low for too long it gets me hard and I take a while to straighten back up, so the light weight is a big factor for me and the power is certainly adequate for most everything with sharp chain (If I bury the 16" bar it keeps eating away so long as I don't force it). More cc's will buy you time and a back ache, but the little saw will get it just as done.
The MS 250 will be my next saw for those reasons and probably a few more I'm forgetting. Don't get me wrong, I liked my '04 346xp, but it just didn't do that much more or better than my 345 to make it worth the extra cost ($300 vs. $475). For the same cost ($299) the 250 is not just a stihl, it's a steal.
MS 250 Chain Saw - High Performance Compact Chainsaw | STIHL USA