Ten is hard... I think a mixture of practical and not so practical, a couple cars I can just drive and a couple I can play with and work on...
Lemme see:
1) '06 Porsche Cayanne (for snow and winter conditions, as well as moving family)
2) '06 Honda S2000 (for me)
3) '06 Honda Civic Si (for daily driving)
4) '06 Ford Mustang GT (for me)
5) '06 Mercedes SL500 (for me)
6) '06 Nissan NISMO-loaded 350Z
7) '69-71 Dodge Charger Hemi (project car)

'06 Aston Marton DB9 (for me)
9) '06 Porsche Carerra 4S (for me)
10) Not sure. Skyline/Supra/Prelude -> a good tuner car