Don't exceed the bar length recommended for the powerhead. I like a 24 inch bar. Not too big, not too small. I used to be a feller. Cut 120 foot cedar telephone pole logs with a 28 inch Sthil.
Husky is a good saw. Most pro-saws use sthil, with husky and jonesrudd back in the pack. Just stay away from craftsman, echo, and shit like that. Huskys used to have a problem with the dog on the recoil start breaking off. Whatever saw you buy, use short strokes on the rope to start it!
If I were buying a saw I'd search out a sthil, but YMMV.
Be safe!!!
ETA: Saws will 'kick back' in a microsecond and fuck a guy UP! Keep the tip clear. Oh, and most noobs don't know it but if you even touch any dirt, sand, mud, etc. with the chain...for even a micro-second, you'll learn how to sharpen your saw. Nothing dulls a chain quicker than getting it into the ground! Watch out for dirt and mud on the wood your cutting also. Use a wisk broom to clean off the cut area on the wood....or you'll spend the next 15 minutes filing on your chain.