Based on what I've read, there are special square taper bottom brackets that offer the correct chainline when used with E-type deraillers. I can't seem to find any for sale either though. It may be simpler in the end to buy an integrated spindle, external bearing crankset, all of which as far as I know can accommodate an E-type derailler (you simply don't install one spacer).
Here's an option for under $100 inlcuding BB:
http://www.universalcycles.com/shopp...5&category=380