Still cant understand the cost differential between a good mid priced car\bike helmet and a helio product.
Anyhow here are a some links to to help, bring some light.
A really good overview of the SPH series
http://reviews.ebay.com/SPH-Helicopt...00000002054827
A helmet I have not heard of but is used they say by G-EHMS
http://www.comunicator.co.uk/handbooks/datasheets.htm
The new carbon race suits appear, better than most of the older type of flame proof suits, but you could sweat more.
http://www.chapmaninnovations.com/products/carbonx.php
Here is a link to a cool suit.
http://www.fastraceproducts.com/page.../CTGY/coolsuit
