Get a 100cc saw !! cover all the stuff you ever need to do..
nothing like limbing and cutting 12 inch trees with all that power !!
And for the 100+ cord of wood you cut every year you will need it !
Now with all that being said,after you got by with that chinese saw imagine how nice it would be with a real 50cc saw..you dont really cut that much wood,,you dont cut very many large trees,and from what you have said from your very first post for what you need a saw for there are many smaller saws that will make you happy..
everybody will tell you what THEY think you should have and not what you NEED and can afford. a student correct ? .occasional firewood for the cottage,(remember), trimming in the orchard ??? do you really want to spend three months pay on a saw ??
i have cut many 36 inch trees with a dolmar PS510 , $300,,the husqvarna 350 and it's siblings do the same at about the same price..may not be that fast but will do fine on most of the smaller stuff you have talked about and for limbing..and wont cost three months pay..
Stihl,forget it,they just add on lots of $$$ for the paint scheme..no better than the others,just cost more.
my avatar is of a 42 inch maple with the dolmar PS510 in it i used to cut it down and cut it up..was not easy but shows what can be done.
spend you money wiselly ,, buy small and be happy..