First question I would answer is how often you cut wood?? Do you need a bigger saw than your 110??? The 110 was only a 43cc saw. If you are an ocassional user and only need a smaller 14-16" trim saw, I'd save a few $$ and look at the Dolmar 350 and 420. Both basically the same saw but the 420 just has a bigger bore. And both are under $300. The 350 that dad has is probabally the smoothest running trim saw that I have ever ran.
But if you are serious about cutting and want/need the upgrade, the 5105 is a great saw as well. I have heard several rumors about its predecessor the 5100. Including the rumor that a lot of them burned up due to the 10% ethanol in 87 octane gas thet owners were using.
The husky 346 is a great saw as well. For it's size it is indeed impressive. My only complaint is the pricetag. For what it is, it isnt worth the 500+ IMO. Especially when a dolmar 6400 or makita 6401 can be had for 500 as well. Yes they are bigger and heavier, but will out cut the 346 every time.