I've had the Dewalt 12" sliding compound mitre saw for maybe 3 years now and I'm very happy with it.
For battery I went with Makita 18V. The drill / driver set and the Sawsall and multitool are the first things packed every weekend. I have about 10 tools including some of the 2 battery tools like the chainsaw (yes chainsaw, it starts every time
) and weed wacker. They have worked great for me. When asked I say the obvious, pick one style so your batteries interchange.
I will say if your looking for a sander you can't beat Festool and their vacuum system., but it gets a lot of use with wooden boats.