I would like to offer my experience. I own a Ryobi 12" and have been happy with it for the $100 I paid 7 years ago. I am still on the original brushes. I've cut a ton of stuff with it (including metal) and it gives some very professional results.
But, If I ever bought again I would look for something that is a little more robust and precise/consistent with the angles - I'm talking like pretty exact here - just something that is overall tighter in it's operation. No matter how carefully I align this saw, I still get a little movement/drift during the actual cut which can cause some corners to not mate as well as I like. This likely correlates to the price I paid for the saw. I do a lot of custom molding around my house and honestly, most people wouldn't notice the flaw, and caulking the corner is easy enough. However, I also build picture frames from large ornate molding so fixing the corners is a little more involved. Next time I will buy something that is more robust and exact with the angles.
No matter what you get, I highly recommend spending money on good blades. I use Hitachi blades and couldn't be happier. I have a 90 tooth blade that leaves the cut smooth as glass.