Looks like a lot of good advice given. From a property owner as well, your "little 120 acres" implies to me that you plan on being there awhile. Best advice I've seen and wish I took the first time around is to get the best you can afford - there's a saying something like "quality is appreciated long after the price is forgotten." If I were in your situation, knowing what I know today, I'd invest in a tool that I'd use for the next couple of decades. Scrape you funds together and find a way to purchase a ported 562XP with 20 and 24inch bars. Since you pretty much have to buy on line - there are a couple of folks who you can turn to that are sponsors of this site and have ported new saws for sell (both Jonsered and Husqvarna).
Reason for a 562XP - latest technology with auto tune - as a property owner, if you're like me, that will be appreciated in the years to come. 562XP is light enough, yet powerful enough to handle the trees you've described. Reason for porting - more power will be needed at some time in the future -
Next purchases need to be PPE (Chaps & Helmet) (See other threads or just go to labonville (dot)com)
Next purchase grab a Pferd CS-X (much debate on how to keep the chain sharp - but my opinion is this fool proof and you'll need to maintain a sharp chain).
Lastly - only use Non- Ethanol Fuel with synthetic oil.