Here's my 2 cents based on 25 years of homeownership, being a landlord, DIY'ing and vintage RV restoration:
For the home DIY'er:
1. Buy that Skil Circ saw, put a diablo blade on it. Get the magnesium version, they're right. This is the tool for quick cuts of dimensional lumber, and the right choice to cut sheet goods when building.
2. Buy a 10" sliding compound miter saw. I bought the cheap HF one after literally breaking my old Craftsman non slider. Put a Dewalt or other Good Blade on it. This will make short work of boards wide and narrow. If you are a professional house or deck builder you might want the 12" but the cost is not worth it for a DIY'er, when you can whip out your circ saw to finish that one huge cut.
3. Buy a cordless jigsaw. I have the Ryobi green one and love it. Upside down, side ways, PVC, copper, aluminum, these can do it all.
Then, here's why you want other saws:
4. Sawzall: this is a destructive tool, for cutting out beams, structural members, pipes in place, limbs, etc. If you are doing tear out, R&R, old house or barn work, get this.
5. Multitool: The vibrating saw. This is VERY effective for cutting new holes for outlet boxes, under cutting trim, and there's a very cool way to cut out a board from a wood floor and replace it using one.
6. Table Saw: Going to make cabinets or furniture? Get this. You'll find lots of uses once you get one but most of the other tools can cover for it.
7. Bandsaw: You're not ready. Had one for 20 years and I still can't cut straight with it. But it does make short work of your kids pinewood derby car design.
8. Radial Arm Saw: Like your thumbs? Then forget about this one.
John