So after a few different test drives yesterday, I think I'm settled on the Z4. Thinking budget wise I'll probably be looking at the pre-facelift with plenty of toys.
Got one to view in a week that has the full sports interior (wheel/seats), seems to have near enough every option ticked except for factory sat nav (not an issue with bluetooth and a smartphone). Also had a new roof motor relocated, DISA rebuilt and uprated seals on the VANOS, new springs and shocks 2 years ago.
Only downside is the black interior! But its something I can live with, not going to pass up a well specced and priced model just on interior colour