You can use two 32GB USB drives at once for 60ish GB of space. --- http://www.forzamotorsport.net/en-US/gallery.aspx?gamertag=TheBlueStig My Forza 4 gallery, all paintjobs available for purchase on my storefront.
My 16 GB version of that drive has been performing great since they updated the 360 to allow flash drives. I imagine that drive would work fine as well. Get it and test it, if it doesn't then return it. --- Everything's shiny, Cap'n. Not to fret.
I was just looking at one like that at work today lol. My younger bros are going to need it for gta and I hope the one I was eyeing works. --- been on gamefaqs for ages and I get modded for giving out two beta codes to gears 3 v_v