C: Your are cutting in the same range as I . I have currently both Husky and Stihl that I use frequently . Also a few Old Pioneers's that I keep just for display and nostalgia cutting once a yr lol . The MS 260 and 361 are both excellent Pro grade that get brunt of my cutting .
I have my Son who helps and has Husky 346 XP (my former saw) and a just acquired Rancher 460 .
So to answer your question I favour a 18" bar for all around use . However on the 60 cc class saws I have utilized 20 " for larger tree usage . If I were to recommend a saw at a good price and $$$ was at a premium I would not hesitate at suggesting either echo 400 or a efco 152 great saws with world class construction. Otherwise a Husky 350 or as my Son did the Rancher 460 is an extremely good saw built on a very sturdy chassis . I believe he paid
paid $450.00 complete with a saw box and two files and a 6 pack of oil . The 50 cc class saws are in the $300.00 range . Locate a Dealer and checkout his business and get a feel for what you really need . A Pro Saw is nice but not an necessity . The most cutting being done today is with people like you using Consumer Grade Products , they get the job done .