I really rate the All Sports stuff:
Enduro Load is their race fuel:
http://www.allsports-online.co.uk/allsports.cgi
Their recovery is second to none:
http://www.allsports-online.co.uk/allsports.cgi
The isotonic is good too:
http://www.allsports-online.co.uk/allsports.cgi
And if you need a boost in the end of the race:
http://www.allsports-online.co.uk/allsports.cgi
I have used SIS, Hi Five etc etc and its all to sickly for me but this stuff is nice to drink and goes down easily
If you have any tech questions drop them a line, they are usually very helpful
I dont work for them by the way, have just used it for years !!