I've had to re-adjust my budget after speaking to a lovely forum member recently

I'm after an E89 Z4, I have a list of desirables/essentials, but (strangely?) the cars condition would be more important than spec for me...
So essential: M Sport spec, manual, mileage below 50,000, full service history (not necessarily main dealer), heated seats, 19inch alloys.
Desirable Plus!: I'd really like better than the base speaker system - but again, if everything else was perfect, I coud live without and potentially upgrade later;
The only colours I wouldn't want are black and dark blue - previous experience puts me off these colours, so White, Valencia Orange, Silver, Grey, Red I would love, and really have no preference, it's the condition that matters to me more.
Obviously, the better the spec the better, but I wouldn't be put off by lack of iDrive, or comfort pack, or other items deemed essential by others.
I would be subtly modifying the car anyway, so would not be put off by a sensible remap, springs or spacers. No lairy stickers or stripes please!
Hoping to grab a really well loved and looked after zed, so if you're contemplating selling, let me know!
Many thanks,
John