I'd recommend the faster SD card! It appears to me that the bigger capacity are faster. The 4-Gig one I have is MUCH faster than the 1st one I bought which was, I think, a 16-Meg or 32-meg. And the cost differential over the 5 or so years between the purchase of the 1st one vs the latest one almost a square-root! The 1st one was about $60 and the last one was only $20.