Having owned a RX8 for over 4years, I would strike this of the list, not trying to do Cesc out a sale, but the MPG is crippling, there's also the start up shut down procedure, which if not careful will cause flooding, a nightmare to sort if you are not very technical. The oil consumption isn't really a problem and for a sports coupe it is very practical. Not what your Mrs needs methinks, while you can get them at knockdown prices, if anything goes wrong, it's expensive.
Loads of alternatives out there, for £10k she could just about get a split new Seat Ibiza FR, not everyones cup of tea but has reasonable performance and great fuel economy. One of my daughters had an Aygo and that was flippin brilliant, not much of a load space but 4 adults will fit in, probably getting a bit dated looks wise.
Leon, Golf, Audi A3, are all good marks and virtually the same engines, Mazda MP3 are like the proverbial off a shovel and very practical.