Lotus Exige V6 - won't depreciate much at all, if you can stretch to £50k then the LF1 variant. Has been holding price very well.
https://www.pistonheads.com/classifi...dition/7520551
Lotus Evora S - Been in the £30k to £40k range for several years now depending on age and mileage
Cayman will depreciate like a stone over 5 years, just sold mine after 9 months, fantastic car though.
R8 especially a manual and again if you can find another £10k then the V10. Lost just £500 after 5 months ownership of a V10 could easily have been a small profit if I had held out for a better offer.
I've just bought a 2007 Lotus Europa - will hold it's value. An Elise with more sound insulation basically.
Will Blackham (respected for his stock choice in the Lotus community) has a nice one here:
https://www.pistonheads.com/classifi...y-rare/7778910
Check the rest of his stock. The Sports Racer Elise - I used to own that model (only 50 built) and it's worth more now than I sold it for about 7 years ago.