With a small space, mobility is your friend...and you can accomodate that with the cabinet saw of your choice, a mobile base and a router table wing, such as one of the cast iron products or something made of composite materials. That gives you a lot of functionality and accuracy, but lets you spread things out while working and pull things back to accommodate the perceived expectation that the other bays will contain vehicles "from time to time". That said, your dust control system should also likely be mobile to accomodate this flexibility, too...until, of course, you say "the heck with this 'garage for vehicles thing' and take over more space permanently.
--
The most expensive tool is the one you buy "cheaply" and often...