I picked up the SanDisk 16GB Extreme Pro (SDCFXP-016G-A91) and it's been great. Super fast and no issues with buffering.
The SanDisk 32GB Extreme Pr o
CompactFlash Card (SDCFXP-032G-A91) @ B&H photo is only $315 (** Normally $390, but you have to add it to the cart for the lower price) AND if you use bing.com
you might get 3% back as well.. oh and FREE shipping from B&H right now...