I got this Verbatim 16GB since it was reported to have good write speed and I saw it for $35.
http://ecx.images-amazon.com/images/I/41sUHo5cDFL._SL500_AA280_.jpg
I copied a 1.4GB file onto it. It wrote at a steady 10 MB/sec. Only thing is it's the type with the plastic slide and feels really flimsy. I'll just have to wait and see how well it holds up to plugging and unplugging. The A-Data rubber coated jobs feel very solid and seem to be rugged, but they only write at half the speed of this one.
edit: I formatted it to NTFS. Crystal Disk Mark shows about 11.14 MB/sec sequential write. More than twice as fast as my A-Data rubber coated ones. I just hope it holds up.
You can't tell. I read some customer reivews of the A-Data rubber coated ones that said they fell apart after a couple of uses. The rubber gives it weight, cushions shock, and gives it a solid feel. But, if the glue gives out, it gives out.

Edit: I notice good prices on this USB here and there. But, even though the write speed and cost are both reasonable, I don't really like it and wouldn't buy another one. Plugging and pulling from the USB connector is tight, which makes it a struggle. You have to jam your thumb against the little stop on top of the slide to plug in. Then when you pull it out, that stop is pulled by the slot in the plastic housing. I know this thing won't stand up. There's no way the innards can have that stress put on it and the thing last. They should have put the electronics in a unit with no moving parts. So far that's USBs with sliding bodies purchased, 2, USBs with sliding bodies that I liked after I got 'em, 0.