I have an SRAM Quarq Cinqo power meter for sale. It is brand new in box with all the docs never installed on a bike etc.
It has compact chain rings (50/34) and the crank arm length is 172.5mm - It is GXP BB treading.
Here is a review of the Quarq (The company was recently acquired by SRM as well). this is the best crank power meter available for its price range.
http://pezcyclingnews.com/?pg=fullstory&id=6991
And here is a link to the quarq website:
http://www.quarq.com/
It is using the ANT technology so you can use it with every ANT based monitor (AKA - all Garmin devices can disaply your power reading).
So if you want to take your training to a different level using a power meter - there you go.

The price is $1600 - If you can get it any cheaper anywhere let me know and send me a link :-)
Giving club members first priority before it goes on craigslist/ebay

Thanks,

Shai