Thanks Daniel, so do the T versions have physical coloured buttons or just the appropriate labels avaialble to use in the positions Ron mentions?
Just wondering if you had experienced the difference between the two versions as I'm thinking about buying one from the US?
Same seems to apply to the MX500 as this seller here (Germany) has an MX500 with coloured buttons:

[Link: cgi.ebay.co.uk]

At least I've narrowed down my choice to a 3100, MX500 or Marantz 3200/Pronto Neo....Shame there's no review on the last one, would haev loved to read your expert and detailed opinion!