Using a lower grade saw(then what you have) like, say "Poulan" for the work you mentioned, is like using a push mower from WalMart to mow a 5 acre field.
Removing trees, is considered "logging".
I wouldn't exactly call what your doing, the personal work of a homeowner or home use.
So what your doing would be considered semi-commercial.
You also seem to know the difference between high quality and low quality saws and you seem to know how to use one, unlike most that only use a chainsaw 1-2 times a year. (no offense to anyone) that's just the way it is.
Husky is right behind Stihl when it comes to high quality and best reliable (commercial use) chainsaws.
You'll find that, compared to a 16" bar, a 20" or 23" is much more comfortible because the strain in your arms from holding the 16" out to cut and trying to keep it balanced is all gone. The longer bars do the work for you.
You can replace that 16" bar with a 20".
Most shops that repair saws or sell parts will a have a 20" bar and chain package.
Note: parts suppliers will usually charge more. A good repair shop will usually sell you the bar and chain and install it for you at no extra charge.
BTW, Are "anti-kickback" saw chains required in SD? It varies from state to state.