Dana
I've been very satisfied with my Ravenspring. Breathable and custom sized. Gaskets fit nicely right out of the box, no trimming needed. After 4 years of medium duty use it still in great shape with healthy looking gaskets. At the time it cost me about $600 w/ shipping, import duties and relief zipper (a must but optional) Being a direct buy from a British Co. the cost will depend on the exchange rate. Worth checking out.
http://www.ravenspring.co.uk/system/index.html
Gerry
Red Stripper (Explorer wanna-be)