Basic cuts. I'm tired of using my circular saw to cut 2x4s, 4x6s and other things. I'm also trying to build my workshop wisely and want to invest properly.
I would probably go for a 10 inch sliding compound miter saw. They're cheaper to buy blades for, easier to find blades for. With the smaller blade, they spin faster than a 12 inch at the same speed so you can use few teeth per inch for the same quality. its cheaper to have the blades sharpened. there's less blade flex for more accurate cuts.
Then again, if I was constantly cutting wood that needed the extra capacity without flipping it over, I'd go for a bigger saw.