Well I decided to plump for the 65R, for only £16, I convinced myself it could be a bargain! As it turns out .......... I love it! More aggressive than the Muhle R89 and EJ89, even more aggressive than my favourite Merkur slant bar, but boy is it smooth. Gives the most audible feedback I've experienced, works well with all my favourite blades - PermaSharp, Polsilver and Rapira - and well weighted and balanced and I do like the ornate handle. So chuffed I got it. Not sure what Parker's following is like, but the 2 I own, I just can't fault them for performance or value for money.
I'll definitely be looking at Parker in the future when I try to unsuccessfully convince myself I don't need ANOTHER razor.