Compact flash memory cards

[Liquid yellow 182]

Is it worth getting the extreme version which costs more or go for the 30mb/s?

Thinking of this one?
http://www.ebay.co.uk/itm/SANDISK-1...AsAccessories_MemoryCards&hash=item20c6165817

Off to America in 4 weeks so time to upgrade to more memory.
Cheers