with protection you want to spend as much as you possibly can, not find the chepest. If you think you need a full face helmit then it is worth putting every penny you have in to getting one. If you don't have muh money at the moment (like most of us) leave the leg protection and at least your head will be safe.
I have Race Lite pads for my legs (£30/35 I think), pretty comfortable and you can strap them on without removing shoes which puts them up from dianese offerings.
I found the Race Lite arm guards to be too big even the small size, apparently you need forearms like tree trunks to get the strap to tighten enough! I got Dianese arm and elbow guards instead (£30) which are great and very comfortable and DEFINITELY work - witnessed by one f*ck off bruise which could well have been a shattered elbow without them.
For my tete I have a Met Parachute, not a real full facer bit adds a bit of protection whilst giving the chance to breath still.
The Met isn't cheap though, that Fox tracer is half its price.
ill second dianese's elbow/forearm guards, really good fit and stay where they should. just be carefull as the sizes tend to vary a lot so trying on is a must, infact have a good old brake dance round the shop to make sure it stays on.
i also use the old style roach indie shin/knee guards which are good but a bit warm compared to the newer ones, and i wear a switchblade which is ace but apparently they dont make em anymore (?)
im going to replace the indies with some dianese when ive got the dosh just to make the matching pair (tart)and becuase i like the feel and fit.
as for the fox lid as long as its got a kite mark on it then its going to be good enough, maybe not the best money can buy but it wouldnt be on sale in the UK unless it was safe.