Hi Ou40,
I would recommend you get a table saw.

Far more versatile. There are certain things a ra saw can do much better. However, it easier to lay a dado for a bottom board for a draw in a table saw and cutting tenions. Also, you can crosscut and rip big pieces. You would limited on a radial arm to its arm length. In fact, I am only touching on the obvious advantages. If others would reply, I believe that they could explain better.
The advantages to a ra saw are that they can cut long boards the best. However, with a little ingenuity, you can make your table saw do that too. With an outrigging roller table, that you can make or buy. A chop saw, or otherwise known as a mitre saw, can cover many other bases in a addition to a table saw. If your budget allows for it in the near future.
The other reason I could see getting a ra saw, is to cut shallow dado's for vertical dividers in a very long shelf. Which can alternately be made with a straightedge and a router.
At any rate, there is my 2 cents.
Joe
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Give me another beer, bartender.