SDHC class 6 memory cards for Vixia HF-S100

I consider to purchase HF-S100 (22Mbps-max.) and additional SDHC 16GB cards. I also want to use the same card for Panasonic TZ5 digital camera.
As of now, my choice is SanDisk Extreme III, 16GB class 6 cards, 30Mbps read and write speed. It has good users rating and arguably claimed as the fastest in the world. In addition, SanDisk will label all previously class 6 cards as class 10, beginning of August, 2009.
Panasonic also has similar card (22Mbps) which is out of my budget.
Does any one has a practical experience of using SanDisk Extreme III, 16GB class 6 card with Cannon HF-S100 or with similar camcorders 22Mbps rate? Please be specific and stay on subject. Thanks in advance.
aman

Your choice of Sandisk Extreme III is a massive overkill for the rather low bitrate requirement of HF-S100 (which is 24Mbps, and not 22Mbsp). Sandisk support 30 MBps (with a capital 'B'), which translates to 240 Mbps (with a lower-case 'b'; not 30 Mbps, as you stated). There are 8 bits in a Byte, and the usual marketing material for memory cards specifies the bitrate in bytes per second instead of bits per second. This causes great confusion for consumers: bits with a lower case 'b' (Mbps) and bytes with an upper-case 'B' (MBps).

These AVCHD camcorders require Class 4 card (min. sustainable data transfer speed of 4 MBps, which equals 32Mbps). Class 6 cards provide minimum of 6MBps (48Mbps). Even the cheapest, slowest Class 6 SDHC cards will provide twice the necessary bandwidth for successful operation. There is really no need wasting $80 on a 240Mbps cards when a $30 32Mbps card works just equally well. The only benefit that you could possibly get with a faster card would be when moving those AVCHD files over to your computer via USB2. A faster card would reduce the time it takes to copy/transcode the data.

Obviously, if this card is your definitive and final choice, it will work perfectly fine in a HF-S100. It is just that you could buy two slower cards for the same money and still be more than fast enough.

I would also consider buying class 6 from another brand unless money is no object. They are only around $30. Although class 4 is minimum required for recording, copying from class 6 is a bit faster.

Whether SanDisk have the fastest class 6 cards I don't know. Last time I checked (several months ago) the speed tests didn't indicate Sandisk was faster than other good class 6 brands.

Newegg and supermediastore have pretty decent prices by the way.

Firstly, ZOMG... I registered to this site over 6 months ago and finally!! it's allowed me to post :)

I want to get say a 16 gig SDHC card for my High def camcorder which takes class 6 cards..

I wanted a Sandisk extreme 16gb and i got quoted about $250 but they also have a Silicon Power 16 gb class 6 for $90...

Thats a HUGE difference for the same class card, any idea why? The brand/speed/reliability/warrenty??

edit spelling, was so excited to be able to finally post

SanDisk most likely are more thoroughly factory tested and maybe they are slightly more durable. But I don't think it's that clear if chance of failure is really significantly lower. I still would backup if these are important recordings.

I'd consider cheaper brands if they have large favorable user reviews (for instance checking reviews on newegg.com or other).
Also consider that you can buy 2 cards for price of 1 which kind of gives you extra backup capability/storage.

If someone needs the card for a very important occasion I could see if someone would go for a expensive card. In the end it's a personal preference but most cheaper cards are pretty decent and price diff is huge.

Both prices seem very high. At newegg/supermediastore you can get SanDisk class 10 for $99 and AData or similar for around $35. Not sure if they cheap overseas.