If you could only buy one electric saw, which would it be?

There ought to be something out there that works like a hand-held circular saw and also can be slid into a nesting spot in a table and thus become a table saw. Getting really creative, I can imagine a table with a mountable tower and arm. Mount the saw on the arm and you have a radial arm saw.

I don’t even know what to Google to find such a versatile tool, though. Is there any such? If there is, how do I find one?