Your best bet for a UWA is a Tokina 11-16mm f/2.8. If you can find it in stock it goes for $600 USD. The "nifty fifty" (what you bought) is an excellent lens for the right purpose, like portraits without distracting backgrounds (5-blade aperture is harsh). The EF 50mm f/1.8 is what's called a "prime" lens, which means only one focal length, which leaves room for a larger (numerically smaller) aperture.
Your kit lens (great lens for what it is, IS really works great on it) and a tripod should take excellent pics inside, with the right composition.
S52|ZF|TRM Coilovers 670/895|Staggered 18" 5's
Last edited by Axxe; 02-06-2010 at 10:24 PM.