As for the RH wheels, they now come in 17x7 ET45, as well as the old 17x8.5 ET55 (not recommended, cos it's too wide and you'll need spacers). You can take a look here:
http://www.mini2.com/forum/group-buys-mini2-special-offers/47138-group-buy-rh-qa-maxilite-wheels.html
The stock S-spokes is probably the cheapest option if you like that style. Just buy them off the right
MCS owner who's planning to switch to aftermarket wheels.