Ya I wouldn't buy a card that's faster than the top performance of your camera. If you have an older model camera you will be able to get cheaper/older cards that nobody wants any longer.
I would imagine you could get 4GB+ cards all day long for $20 US each.
The thing is 16gb card at 400x (Transcend) which is blazing fast already and can handle a 7D no problem is only $60. You're not saving much by buying a 133x 16gb card.
It's like people "saving money" and buying a Pentium 4 today. You could get one of those dirt cheap AMD chips of today's generation for very little too and come out with performance way better.



