I can suggest the one I have been using. http://www.amazon.com/Patriot-Flash-256-bit-encryption-PSF32GBTUSB/dp/B003D8V8KM. Very smooth reliable transfer and delivery. It was recommended as one in a list by Pulse I believe. I keep adding WAV files to this it is a bit over half full now and performs great.
Just don't get a cheap one if you don't want to have issues with speed I would say and reliability. This little stick I recommended is solid little tank. Don't buy it without buying a keychain USB sleeve or something - you don't want to loose the cap but above all so you don't loose or damage it.