ERP Software selection

I was wondering if anyone could help me out a little with ERP selection. My company is currently using Protean/avantis by marcam and we are not satisfied with it. We are considering switching software and I need to compile a list and compare the functions and price. The user interface will be very important. The packages we will need are warehousing, inventory, procurement, finicials and good reporting abilities as well as support for EDI.

Any advice or links (urls) would be helpful.