A-Data Turbo speed 150x is cheaper. No need to get Sandisk Ultimate so expensive. The camera cannot utilise the high speed of 133x anyway... balance cost & performance is better. 80X speed is also considered high speed. There is the Transcend 80X also.
for prosumer digicams, i dont think its really necessary to get super high speed CF cards.
really, the only time you can tell the difference is when you are burst shooting several frames per second and u need to be able to write to the card as fast as possible.
A high speed card SD card, i.e. 133X, is recommended if your digicam can take video clips at 640 x 480 resolution. A slower card may cause drop frames when taking video while the higher speed card will sustain the minimum write speed for smooth video.
If you're not taking video, a cheap normal speed card would be suffice in most cases.
I believe subaru_sti_22b was talking about talking still pictures and not video. I mentioned the need of high speed card to capture smooth VIDEO at 640 x 480 at 30 frames per second with some of the new digicams. The digicam will be constantly writing to the memory card during the video capture so the write speed of the memory card is a specification that is worth looking into.
I own a Panasonic FX-9 which can record video at 640 x 480/30fps in MOV format. The manual states "When you set the picture quality to 30fpsVGA, we recommend using a high speed SD memory card with 10 MB/s or greater displayed on the package".
A 17 second clip that I took a couple of months ago, taken at VGA quality, has a file size of 24 MB.
It does not mean that the camera can write at 10MB/s but rather a fast card will not be the bottleneck in capturing videos. Anyway, 10MB/s is theoretical speeds under certain conditions and would not be the sustainable burst rates.