I really, really like my DFI Lanparty ut SLI-DR. It performs great and has a whole bunch of features that make setting up a system and overclocking it really pretty easy. I have not used one of those 32x systems, but I would imagine it would only benifit you if you where running two video cards.
I would suggest the DFI Lanparty ut SLI-DR, but those others are good choices too from what I hear.