You don't say new or used. But a used 520D is bigger and can be be found for less.
I'd agree - and I've got a 3 series estate. The 5 touring is enormous.
However, what's the 'best' estate car can mean very different things. If you want massive space for minimal price, then the Skoda estates (Octavia or Superb) really make a lot of sense. The Hyundai i40 tourer is a remarkable package for the price, and there are plenty of others out there that offer very good space at reasonable cost.
If you want driving dynamics and handling, then, to me, the 3 series is perfect. RWD (most of them), and even the 320d is no slouch. However, you pay a premium for that badge on the nose - just as with the A4 (which doesn't do anything for me) or the current Merc C class(bling-tastic!)
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