Big money alright but its only a bit over what the best cars are moving for in the UK right now. A friend enquired about this car when it was at Classic Hero's and was told politely that they weren't responding to offers below the £25k asking price. These have shot up quite rapidly over the past 3-4 years in the same way that a lot of classics have and the question is when will the market run out of steam and what happens then.

The key will be how many people try to head for the exit at the same time when the market turns and how many that are in hiding come out of bubblewrap, storage, etc. By sheer force of numbers, if the market tanks then the e46 and e92 will drop significantly, probably the e46 most because they are around in numbers and have jumped a bit over the past couple of years, so they have some ground to lose. The e92 will probably drop but not by as much because they're still in the regular depreciation curve and so have been shedding value anyway, and they are probably more usable simply by being more modern.

There are a fraction of the number of e30's remaining compared to e46 and e92 and they are older so further up the "nostalgia" graph so these would get my vote as the best relative store of value in the event of a crash. That's not to say they would be immune from dropping somewhat, but relatively less than the others and more likely to rebound when some normality returns following a market crash. The caveat is that this assumes that the examples of each are the very best of each.