You are right - I am swaying to these now aswell. I think these are S104's, they look brilliant but they are very pricey indeed - circa £6K for the set without tyres.
Pricing sounds about right. Don't forget to add on TPMS sensors if you are keeping your OEM wheels for winter etc.
I had mine imported which worked out a little better. They are a good investment as HRE's are rare in the UK and retain their value.