I'll second this. I use a pair of Yongnuo YN560 strobes on stands with diffusing umbrellas. I think the strobes cost me about $75 apiece, and I got a decent deal on the stands and umbrellas. The whole set probably ran me just under $250 for two lights, two stands, and two umbrellas.
They're completely manual (no TTL, E-TTL, whatever), but to me that's not a real drawback. If you're doing interiors, being able to manually balance natural and artificial light is a plus.
The Yongnuo flashes have built-in wireless, and the transmitter is dirt cheap. This means you don't need to buy a Pocket Wizard or other wireless hot shoe adapter to go with them, and you won't have any cords to trip over. This makes it very easy to re-position the lights. Yongnuo also sells a more expensive transmitter that lets you remotely change the settings on your flashes.
If you wind up needing to balance natural and artificial light, the Rosco Strobist gel set is a nice add-on. It includes a good set of gels for balancing against tungsten, fluroescent, and sunlight.
Sorry for rambling. bravomail is right. They're solid, inexpensive units.