I have just purchased a 2nd hand 535d GT and I have to say it is a fantastic car!
The 'basic' car is highly specked and the one previous owner had paid a further £12,500 for additional options on the car. With 50,000 miles on the clock at my purchase date, the car now being two and a half years old I was able to buy for 40% of its OTR price in 2010.
Fantastic luxury, sport whenever needed and brilliant for my golf equipment storage.
The car is a joy to drive and the new iDrive is superb. With the all singing / dancing telemetry provided by BMW Connected-Drive it's an absolute delight to get behind the wheel.
I've been driving BMW's for the past 35 years and the GT really is the best car I've ever had.
There aren't a lot of GT's in the UK and it certainly gets people wanting to have a closer look at the car when they see it.
Undoubtedly you'll find the right GT to suit you. I love the 'boys toys' on my car.
Good luck with your future purchase....