I was considering those replica wheels from eBay but decided against them, mostly because my friends S3 has replica wheels and they have started to fade and the paint is bubbling, i'm not sure if this is because they're replicas but it put me right off.
Offset I believe is ET55.
Not sure about stud diameter
Non-runflat are much quieter, lighter and give a smoother ride. I much prefer them over runflats. Runflats obviously give you some peace of mind tho. I just carry a tin of holts tyre weld in my car. Be warned tho, if you use this on a small puncture, the tyre cannot be repaired.
If you like the s-spokes then you'll love these...
http://www.mini2.com/galleries/showp...hp/photo/16831
They are RH Alurad Maxlites. The 17" version is the perfect fit for a MINI. I got a quote from a company in Dewsbury the other day, £450 for the wheels and £65 a tyre for some Toyos. I absolutely love these wheels!