Memory cards for K5?

Hi guys, I'm looking to purchase a couple more memory cards for my Pentax K5. I currently use a Transcend 8Gb Class 6. I want to get back into my aviation photography this year so I've been researching the various cards and looking at numerous forums but its all very confusing, i.e SDHC UHS-1, Pro, Extreme etc etc. Can anyone please recommend a decent SDHC card that will help with the capture of images at air shows? - the Red Arrows tend to be pretty fast!!
I read a forum recently where it stated that Pentax DSLR didn't support memory cards that are UHS-1, is that correct?
Thanks
Chris B

I use Integra Ultima Pro Class 10 16Gb. Always been fine. Would imagine they're around a fiver each now.

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[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283

Whatever you do make sure they are Class 10 - SanDisk is a good choice - as there is a big improvement over Class 6

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K-3 II, K-3 and a K-70 from SRS (having now relegated the K-30 /"K-50" to a backup body), & some Sigma and Pentax lenses (and a lot of old 35mm gear!)

Hi guys
Many thanks for the advice - a couple on order!
Happy New Year!
Chris B