From just about everyone I've hear of buying a "chrome" oil pan or tranny pan... they have nothing but problems.
I've hear nothing but good things about the Aluminum pans (as long as it's a quality one) And if your going to get a new pan, get one with a draim plug if you can. You could at least change or inspect the fluid when needed with out dropping the pan (other than a filter change)
As Kel pointed out, Jeg, Summit etc have a good selection usually.