Hi mate,
Mine will be for sale very soon but doesn't meet all of your criteria!
2004 (54) Private reg: SE-Z4-319
3.0 SE Manual
Saphire Black
Red leather - Heated and Electric with memory function
50.000 miles Full BMW History
NO NAV
NO PARKING SENSORS (it's tiny anyway

)
Quad Exhaust Conversion with Modified Backbox (few pops n gurgles - no loud bangs!)
19" CSL Alloys with Falken Tyres
Modified Headlights - Angel Eyes with Xenons
Eibach Springs
A few other bits too
But it's also not under £6000. More like £6750.
The sale post will be up soon, here's a few recent pics for you, HARDTOP NOT INCLUDED.
http://www.z4-forum.com/forum/viewtopic.php?f=7&t=71605
Drop me a pm if you wanna have a chat about the car. It's not near Wales either, it's in Brentwood Essex. :roll: but worth the trip IMO! (All be it a little biased :wink: )
Dean