So as glamorous as the new i8 Roadster might be, I'm more excited by the prospect of one of the early cars, which have now dropped in price to less than £60,000. Take this example, the cheapest in the classifieds at the time of writing; as an approved used car, it has a guaranteed full service history, and while the mileage is a smidge above average, it's still done less than 30k - barely run in, in other words. Yours for £58,000 - which means, compared with cars that started out at roughly the same sort of price, it's depreciating less quickly than the BMW M6 (but more so than the Audi R8).
Model S 85, endowed as it is with a low 20,000 miles and a full history, with a BMW 730d (£22,117), Audi A8 3.0 TDI (£23,990), or even a Mercedes S-Class Hybrid (£39,994) of a similar age and mileage.
Of course, stories abound of issues with Tesla build quality, and perhaps these will take their toll on values; either way, I'd have to question whether the Tesla's really worth the extra cash as a used buy. OK, so you do get the rapid standing-start performance everyone talks about - but only if you're doing stratospheric mileage are you ever going to recoup the additional £20,000 or so in savings on fuel.
But what if you want to spend that £22,000 on a bit of electrified performance motoring? Well in that case, I reckon a used Golf GTE is looking like a sound bet. At a shade under £20k, a two-year-old example like this will cost you more than the equivalent GTD, or even the GTI, but the flipside is that GTE prices show that the market does value plug-ins like these; prices aren't crashing and burning once they hit a year or two old. Chances are that trend will remain the same and you'll see back more of that initial investment when you come to sell on. Let's not forget, too, that you can plug your GTE in at home and enjoy bimbling around town for very little money at all on the electric range (31 miles officially, but reckon on closer to 20 in the real world).
There we have it, then: you don't have to buy new to jump on the plug-in bandwagon, meaning electrified cars will soon be within reach of us all. Now all I have to do is put aside a chunk of my heady motoring journalist's salary, and I'll be able to buy one of those i8s in... hmm. About 187 years, I reckon.