If in doubt about speed, but tempted by a cheap price, buy one and test it with one of these benchmark utilities.
(See References section at the end of this document.) Look for average

read speeds > 10 MB/s

write speeds > 5 MB/s.

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SanDisk: Cruzer Titanium, models- SDCZ3-2048 (2GB), SDCZ3-1024 (1GB), SDCZ3-512 (512MB). Contour models all work as well.

Lexar: Jumpdrive Lightning, models- JDP1GB231, JDP2GB231

Kingston: Data Traveler Elite, models- KUSBDTE/256, KUSBDTE/512, KUSBDTE/1GB,
KUSBDTE/2GB, KUSBDTE/4GB. And, Data Traveler II, models- KUSBDTII/256, KUSBDTII/512,
KUSBDTII/1GB, KUSBDTII/2GB.