I think Eclipse have stopped making Cocker stuff to concentrate on the Ego.
Belsales are great, couldn't recommend them enough. There is also Sloth Stuff that stock some other Cocker stuff (mostly Belsales thou)
Ups:
You could get a Eblade (Zero B or E2), but they seem to be rare as hell now (would like one myself). You can get them from the US, but postage/imports are a pain.
If you can get hold of one, then the best upgrade I think you can get is the Evolution Upgrade kit from Belsales (If you want to stay Mech don't install the QEV's, they only work well with an Eblade).
You could get a better regulator, as stock is not great, but won't improve that much.
Or an LPR, Belsales or Eclipse if you can get one.
Cheers
DP