Hmm... I guess I didn't read that part of this post... The saws I have recommended are all big powerful Pro saws. Be careful fallin' those trees. These bigger saws with longer bars are unbalanced and the potential for kickback is very high. When fallin' BIG timber, you really need to know what you are doin'. A small mistake could be fatal. Hell even a small mistake on small trees can be fatal.
I'm not going to go into the ins-and-outs of fallin' trees on this thread... if you do a "search" for it on this board there will be enough reading to keep you busy for a while.
Good luck... and be careful!
Gary