I'm sure lots of guys will chime in here, I'm in Tokyo Japan, so I can't really comment on what you have available there, but I do have some more basic advice.
Find a chainsaw shop in your area, for find a couple of them, go in there and just soak in the place, see how they treat their customers, how they treat each other and how they treat you a stranger walking in off the street. Ask about a saw, tell them what you want/need in a saw and ask for their recommendations, tell them that a good used, or reconditions saw would certainly be an option. A good shop will have saws that guys traded up from, or a good used saw that a pro used for a few years and had decided it was time for a new saw, the used one can often be fixed up and will give a guy like yourself, a non pro many years of good service.
Don't fixate on the brand, I happen to own two Huskys, one Makita and one Shindaiwa, all great saws, I'd also own a Stihl in a heartbeat, I don't think either saw will disappoint you. Stay away from the Borg specials, they are often disposable saws.
If you find a good chainsaw shop and they sell and support brand X I'd go with that, unless you are going to do your own servicing, I think that the shop would determine which saw I'd buy over the brand. You can have the best chainsaw in the world, but if your local shop is a pain to deal with, or they are just slow getting parts etc then it won't matter a hill of beans how good your saw is.
I hope this helps.