Very close to making a decision now!
A battle of the Brain vs Heart
It now seems obvious - I should get a DSI Rev 2 :- is is more powerful (3 EGs 4 LFOs), quality 5 octave keybed with aftertouch, no stupid alien inspired LEDs and doesn't try to rip me off with extra cash for end cheeks. (and will likely hold its value in the future)
However, I had a play on the System 8 and I gelled with the interface immeadiatly.
It does the vintage poly thing pefectly and the lack of LFOs can be mitigated to some extent by sequencing control signals.
I do have a nasty feeling that if I buy the S8, Roland will release a proper update with a better case and keyboard. If Roland had done a decent job in the first place the S8 would be a no-brainer - someone at Roland need a 'punch up the bracket' for not designing this thing right in the first place!
Will continue to mull this over for a short while - but heart is likely to win