Companies spend millions of dollars developing engines to run efficient and for long periods of time. As soon as you change that balance with modifications, you can bet with any car it will decrease in reliability.<br><br>XR6T's are cool, but with any Australian produced car, will depreciate in value rather rapidly. So if you buy the new FG for say..40k, drive out the showroom, and your re-sale is 35k or even 30k.<br><br>R32 GTR's are a solid option, because they are not going to depreciate in value. Buy for 15k, you can and will sell for 15k after that. Depends on how you drive also in regards to 'breaking down'.<br><br>R34 GT-T's, for maintenance would be the best bet. RB25 parts are becoming cheaper (except for gearboxes, for a reason) and will still retain value. will usually have less KM's too than you'd expect.<br><br>R34 from my viewpoint.<br><br>Check out Volk34's r34 4 door in the for sale section.<br>