MarineWithWings, here are a few links to fuel manufacturer sites.
Of course, every one of them is "the best." Ask any of them and they'll tell you how great they are.
In reality they are all good and you can really buy based on price and availability as long as the nitromethane and oil content is suitable for your engine. The manual for the engine should have these recommendations.

I have personally used the following brands with no issues at all
Cool Power http://www.morganfuel.com/cp_main.htm
Magnum http://www.magnumfuels.com
Omega http://www.morganfuel.com/omega_main.htm
Power Master http://www.powermasterfuels.com
Ritch's Brew http://www.ritchsbrew.com
Wildcat http://www.wildcatfuels.com

Fuels I've never used, but would use if locally available for a good price:
S&W http://www.s-whobby.com/fuel.html
Cooper http://www.cooperfuels.com (web site says the fuel is now sold through S&W)
Byron http://www.byronfuels.com
SIG http://www.sigmfg.com/cgi-bin/dpsmar...FV4.html?E+Sig look under 'Field Equipment'

My list is not complete. It's the sites I have bookmarked on my computer at work. Lunch break is almost over...