if they are the 5 spoke alloys they look like Volks something like the GTS i think, but they are big bucks.
if you want good but more cost effective then try Rota's they are an affillated member on here and they do some nice wheels.
as for mods to the rest ogf the car, check out the other affiliates, they are all registered on here and are used by lots of members, the ones that spring to mind are:
EP racing
Envy performance (gaz walker and the chilli's)
CS
Dreamcustomz (P15ULT)
there are others but for the life of me my mind is blank.
my advice ahve a browse throught eh pictures like your already doing and get an idea of what you like. the Zed is a very modable car, and all the info is on here.
my suggested serach areas would be:
pop chargers or filters/ CAI (all the same thing)
Exhausts
Body kits
hope this helps