In reply to innesmac:
Whilst there is nothing wrong with them and they certainly aren't going to break I don't really consider the Helium Friend in the same league as Dragon or Camalots, especially as they cost the same. They just don't have as nice an action. I'd buy a set of DMM Demon Cams, which are a fair bit cheaper, over the Helium Cams.
I have Camalots, but I'd buy Dragons if I was going to buy again as the extendable sling is great for UK trad.
However the Dragon Cam's sling is quite thin and probably needs replacing more often. Also if you are considering going big walling the thumb loop on the camalot is really useful when aiding.
The following would be an exceptionally good cam rack for UK trad that would cover all bases.
Totem Basic Cams: Green, Yellow and Red -
http://needlesports.com/Catalogue/Rock-Climbing-Equipment/Camming-Devices/M...
Dragons or Camalots: Grey through to Gold. If you really want to go to town you could double up on Purple through Red.
DMM Demons 3, 3.5 and 4
WC Tech Friends 5 and 6 if you are going to be doing wide routes.
HTH