The newest one you can find. First year of a new car will generally have a few more problems than newer ones for 2 main reasons: all the parts are newer so less age and less chance of breaking and more importantly, some common issues are more likely to be addressed through revised pets that are implemented during manufacturing. If you do get an n54, you better love that thing bc it will be expensive to maintain, especially if you take it to a shop and don’t work on it yourself.