I have a 2011 Passat Saloon and I'd definitely recommend getting one with parking sensors as it can be hard to gauge the extremities. If you going to be regularly carrying cargo, the estate might be a better choice and the insurance seems to be cheaper (depends on your own circumstances though and if you like estates)
The B6 and B7 have been known for some electrical gremlins i.e. sensors failing but mechanically, the reliability is excellent provided it is serviced on time. The DSG gearbox needs an oil change every 4 years/40k miles and that will run you about £100 in oil £100 in labour
If you go for a later model of the B6 generation, note that the TDIs with DPFs need a blast on the motorway to ensure it doesn't get clogged resulting in a hefty repair bill. Go for a CR TDI as another member suggested. It might take a few days to adjust to the larger size but it's no harder to drive than a small car once you've become used to it.