If you don't already have an MS310, if you go with one of this series, get the 039/MS390 as it's the same weight and more power than the 310. I have an MS310 but have not used it all that much. I've had many 1127 saws and like them. Parts are plentiful and cheap. They're a good firewood saw for the money.
A muffler mod makes a huge difference on these saws.