If i was starting from scratch I would buy a Track Saw first. Either the Dewalt, Makitia or Grizzly depending on budget. (Festool if i was ATOT rich)
I've never heard of these before, but as someone that had to buy a long guide for my circular saw, I am quite intrigued!
Then I would have a good router
I've been hemming and hawing over getting a router for a while. The only thing that makes me reel back is that I've been trying
not to spend a lot of money on tools at the moment, and routers are something that look cheap... until you see all the stuff you might want to buy. I'd like to try replacing a drawer that was not built well, and I considered buying a dovetail jig to help making it a bit easier; however, that's a good $120-180 depending on which one I get.
A drill and driver combo or a full battery powered combo set. drill / driver / reciprocating saw are all the battery things you really need. I have a radio that came "free" as well.
What about an oscillating tool? I don't use it a ton for woodworking, but I've been able to find a lot of surprisingly good uses for it.
After you get tired of using plywood with its perfectly square and straight edges, you will want a planer and a Jointer. These things will help you cut a wavy board only good for boat building and turn it into something flat and straight that is useful.
I've looked at those a few times, but in reality, the reason why I've even considered them is because I go to Home Depot for wood. Some people probably think I'm weird, because I spend a good 10-20 minutes looking for lumber there. However, I do that, because it takes that damn long to find a piece that isn't warped! When I first started, I wasn't nearly as picky, and it showed when I built my garage workbenches. They turned out fine, but you can tell that the wood wasn't the best with how things line up. I'm super meticulous about my measuring and cutting. I'll measure twice on a 2x4 (on both sides), draw a line with a carpenter's square (intersecting both marks), measure again just to see that it's good, and then line it up in the miter saw. After I cut, I check it again just to make sure that it's good.