What sort of projects do you anticipate using the table saw for?
IMO, the limitations to many small saws are their small tables & awkward fences. If you are making small items you won't be troubled by the small tables. If you're needing to cut sheets of plywood or rip long pieces of lumber you'll be frustrated.
An aftermarket fence is a worthy investment (if they are available for portable table saws). You won't realize how nice one is until you use it. Then you'll hate the crappy fences most saws come with.
One option is to make a larger table that holds/surrounds the small table saw. That way you can always remove the saw if you need to take it with you to a job site. But it'd negate your stated desire to save some space in your garage/workshop. But if you built it on wheels then you can move it aside when not in use...
Or maybe something like this: (from
the New Yankee Workshop)