I agree with Zedman, they will hold a good price Dan, and eventually the difference between buying a mk1 or mk2 is purely visual, then just personal preference comes into play. look at 1m's for example, their prices are going up! and there are 400 of them in the UK I believe. there are only 400 mk1 Nismos globally. . .
However: Personally I am grateful to not be hugely at a loss if the new model nails down the price of the MK1s, but even so, I think they will be just fine.
edit: but then if I was worried about spending money on cars, I would buy with my head and not my heart, which would of been an older 370z, put some cash into mods and go that route...
Doesn't really matter what any of us think, you bought the car and stand by it which is what matters
Not sure on the comparison with the 1M as didn't they fly off the shelves and there is still obviously a demand, was talking to a few Zed owners the other weekend, well 2 370z owners, 1 ex 370z owner and a 350z owner and we all agreed the MK2 looks much better but it's all personal preference at the end of the day
Liking the subtle mods you have done, looks very mean now