I can't really give you up to date prices, i bought mine 2 years ago mate
Speak to Adam @ Z1 Auto (or aim him, or email him) he'll help you out.
Once you have a quote from him we can help you compare and add VAt etc.
PS highly doubt the wheels you want from WORK are in stock with exactly the same offsets, size and colour you are looking for.
I say this because WORK are famous for their customisability, basically their wheels are made to order mate. You can have any offset you want, and also any colour you want beyond what they offer.
Just for std colours they are still a custom order item, so seriously doubt Envy will have the wheels you want in stock. That is unless you are VERY lucky, for some reason (cancelled order or similar)