VRT might scupper this suggestion as its noticeably higher than the , but if you are thinking along the e46 M3 lines then what about a Z4 M coupe?

The values on these have been very steady at worst and modestly rising at best over the past year or two. More limited numbers than the e46 M3 and being a bit more hardcore will likely mean it holds its value better, or improves, ahead of the M3.

Even if the VRT is relatively high on one for importation, if you take the view that you'd likely export it at the end of the time with it then you'd get a good chunk of it back.