I'm surprised at the RE001 pricing too.
When they first came out Subaru friendly sizes were $300+.
The two are quite different tyres.
S03 more a general purpose performance road tyre.
RE070 still a road tyre but with the focus on dry performance.
IIRC all the comments folks posted about Shale's Proxes misadventures were based on what Shale posted.
The newest road tyre from BS is the RE11 (RE-01R replacement in overseas markets like USA), probably won't be seen here.
Toyo, Kuhmo, Dunlop, Goodyear, all have new high performance road tyres.
So far only the new Goodyear Eagle F1 Asymmetric has been released in NZ.