Re: need tool shopping advice
The type and size tool you purchase should be determined more by how it will be used than by price.
For most DIY projects, a 10" miter saw will do fine, particularly if it is a sliding style. If you need more cutting depth than that, you can step up to a 12" saw which can cut up to 3-1/2" material. The advantage of a 10" is that the blades are much cheaper. I started with a 10" Delta miter saw and it did the job for years. When I started doing bigger projects I needed a bigger saw and stepped up to the Dewalt 12" compound miter. Both saws performed very well and never gave me any trouble.
Cordless tools are great! You say you only need a saw and none of the other tools in a combo kit. If you've already got a particular brand and voltage cordless drill, then I recommend sticking with the same brand/voltage for the saw so that the batteries are interchangeable. This will cut down on battery and charger chaos. If you've got a cordless drill that is either older or under powered, then I'd recommend a drill/saw combo kit with a higher voltage, again, to keep the batteries interchangeable between the two. As for a particular brand, I've always been partial to Dewalt, though Rigid isn't too bad and the Ryobi brand has significantly improved over the years. While I would not purchase Rigid or Ryobi for professional use, it will hold up fine to most DIY work. There are other brands as well, though I do not have experience with them. One thing you should not do is purchase no-name brands from the likes of Harbor Freight, Walmart, or anywhere else that sells the really cheap stuff. It won't hold up.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!