Business card design ideas

I have been changing the colours I want on my business card for a while but know that I want to use grey. I have been looking at using this green spot colour to contrast with it and have this on the opposite side to the grey.

I don't know whether to go with the spot colour or to keep costs down use CMYK and use a finish, I have been thinking of foiling but don't know if this represents me. I've also been looking at Spot UV as a finish.