I know it's not a 'trendy' car on this topic, but I've now done about 16 months in my X3, did about 22k miles, and I'm still very happy with the car.
The 2L engine is very nice and punchy. In fact, it can be very, very quick with a bit of practice. One downside is the manual gearbox (well, mostly the clutch) -- the gears are nicely staged, but the clutch is not fantastic to be honest; it's very hard (even after 22k!!) to make a 'smooth' start from a stop, it tends to 'stutter' unless I rev up quite a bit beforehand, which is rather silly.
On the road it's great -- I mean, not 'sports car' great, but I can still leave quite a few people behind on smaller roads, it's really very well balanced, it might have a little hint of oversteer sometime, but overall it's near perfect.
I do a lot of smaller roads (A, B) and motorway, and if I drive "tranquil" I do reach the specified 50mpg, but it's hard. If I'm a bit more ham-footed, I do 42-46 or so, and If I'm "commuting, late" I do 40mpg. Overall, not bad for a 2 ton truck!
As far as the 'options' goes, i didn't take the pro-nav, and I don't regret it. My El-cheapo Nexus 5 is FAR better than anything onboard these days. However I took (most) of the gadgets, and they are fantastic. The auto-beam is absolutely /amazing/ as I do a lot of small roads at night; I also have the top view camera which is now completely assimilated and allows me to park without even looking outside the car. Pretty cool tech!
For wheels, I took the 17"'s, as I tought I would keep these for winter wheels and get a set of 18 or 19 for summer. However, I did quite a bit more 'off road' than I originally planned, and I think that was helped by not having 'fancy' wheels to damage. I had a total of 3 (slow) punctures with my run-flats, and I managed to re-inflate (with the small teasco-grade compressor in the boot) and get them fixed without too much problem. I've now grown rather fond of the 17"'s so I'll keep them.
Overall, I would "buy again" -- I migth even be tempted by the 3L version, as apparently it's a bit of a stonker... But even the 2L is nice so... People complain about the noise of the 2L, but seriously, at 3k/rpm, I find it sounds pretty awesome! Nice and throaty