I was thinking I could sign with Aston abd use the Citroen Gr4 whenever I can the NationsYou're locked in for 7 days, not a year, you can always try one this week then one the next week. I actually use the manufactures races to try cars I haven't bought yet. To answer your question though, Aston as I've driven both Gr 4 and 3 and like them both, only tried the Citroen Gr4 but that's still a great car.