I love the Alfas and really love the Spider. They are sexy as hell and the newer variants are quite comfortable and easy to drive. I would also consider the
Fiat 124 Spider. Even the older variants still possess a contemporary look to them and they are a lot of fun to drive. The Fiat is smaller and more nimble, but the Alfa has a lot more power and styling wise, I prefer the Alfa.
The MGB, as long as it's the "chrome bumper" variant, I down with them, but they are a bit on the slow side. If you want British, vintage and sexy I'd opt for the
Triumph TR6 over the MGB, or better yet, the
Triumph TR250 as they are more sought after (and more expensive). The TRs were much quicker than the MGB as they featured a 6 cylinder duel carb engine (as opposed to the B's L-4 engine) and they are a little bit bigger, though the MG is a unibody construction and handles better. Sticking to the British vein, there is of course the
Austin Healey 3000, which I consider one of the sexiest looking British sports cars ever built (the pinnacle being the Jaguar E type (in my opinion), Series 1, or Series 1.5 roadster. (But we're talking some serious dough now). )
Of course, then you can get into the C2 Corvette. Again, in my opinion, the pinnacle of North American automotive design brilliance. But you're getting into some serious cash now. IMHO, the 65 through 67 Corvette with the small block 327 engine is a thing of beauty. The 327 for my money is one of the best engines GM ever built. Even the name three twenty-seven just sounds right. The C2 vette came with several different engine options. Laughable when you look at what the different variants cost back in the day. (Engine options might run you $159.25 that today would add 20 grand to the price of the car.) The C2 Vette styling wise is art to behold and GM has never equaled it in anything it has produced.
I would buy any of the above cars without reservation.
And the great thing about them is that as long as you maintain the car, the car will NOT depreciated. All of the above are dead assed simple to work on and if you have any initiative at all you can fix pretty much any problem you might encounter. All you need is some basic tools and a factory shop manual and away you go.
If you want unusual and vintage, I might be tempted to consider a
Datsun Fairlady (yes, I've seen them, but never driven one). Very much a British clone as you can tell, but basically the ONLY Japanese car that has ever attained the "classic" label as far as I'm aware. Most Japanese cars are just a means to get around in.