I needed something with more doors/practicality after a 3 door A3 and an A5 coupe. I never really liked any of the previous generation Exx BMWs, in particular the interiors, but ended up buying a F10 520d M Sport nearly a year ago. It has the upgraded 19" wheels, run-flat tyres and M Sport suspension and yet it's still nowhere near as harsh a ride as the previous two cars (the A5 even had the "softer" Sport and not S Line suspension).
You will of course need to have a test-drive yourself and no doubt your opinion will be gauged by what car you currently drive. The ride is still firm but not overly so but will be crashy over very poor road surfaces so your choice way be swayed by the standard of roads in your area. Otherwise it's been a great car which has averaged 48MPG over 10K miles;
You will easily get one within your budget but the options that I would look out for are; a 2012 model year car as the economy got better and mine is in VED tax band C, currently £100 a year, 19" wheels (but moreso for resale), Visibility pack (Xenons are fantastic), Professional Navigation (huge 10+ inch screen). Also BMW had some very good value, at £400, 5yr/60k miles service packs which have since changed to £475 and are only 5yr/50K miles so a maximum of only two services instead of three.
Anything else feel free to ask.