Having burned wood for over 30 years, I have some definite likes and dislikes about cutting and burning wood. First thing that jumps out is I never liked burning soft wood like pine and fir, waaay too much rosin and chimney cleanings, and it burns fast, but it does work.
Second, the Stihls of today are not the ones of yesteryear, nowhere near it, and I generally shy away from them. I've had a ton of saws over the years, and some of the old Stihls were fantastic, but alas not now. The old 024 was a great saw, small fairly light by old standards and powerful. The old 041 was a cutting beast. Funny thing, the 028 Wood Boss is a classic saw, and I've never owned one, just never had a chance I guess, I've used them and they were a work horse. If you're stuck on Stihl, look for an old one.
Nowadays, the best saws for me are Echos. I have a 40cc and a 50cc. A big one to fell large stuff, and a 40cc is a great compromise for all around work and bucking. I'm old enough now that I can't use a 50+ cc saw all day like I once could, so those big boys are only for large cutting jobs.
My advice, if you can handle a 45-50cc saw all day, that 's your sweet spot. If not I wouldn't go less than 40cc for a versatile saw.
Husqvarna makes some fine saws too, and I've had a bunch of them too, the 455 Rancher is a nice middle of the road saw. My neighbor has a larger, something like a 60cc Husqvarna, and it will literally cut like a beaver on steroids.
I'm a fan of 16" bars for general work, even if I have to make two cuts. I save the 20 incher and larger for felling and big bucking.
I have to say, I don't burn wood anymore, having installed a gas fireplace insert, which is much cheaper and easier, just flip a switch and heat! You can't own a saw, splitter, and all the tools needed to maintain a wood pile for the price of gas log fireplace. But I did it for a long time. Now I only have saws to cut troublesome trees around the 7 acres I own next to my house and other houses I own. I used to cut even more than just for wood, hired out to remove trees for folks, even helped out electric company and insurance companies a few times, I'm glad I never tried to do it for a living, those guys have my full respect, it's hard work, well beyond the reach of most of the snowflakes we're raising today.
I salute you that you're willing to do the work. Remember, a sharp chain is your best friend, no matter how big a saw you have.