My 96 3000GT SL was the best car I've ever had (I had a 98 SL also,but I preferred the 96 over the 98,due to a manual tranny and it being bright red!). BUT,I bought it with only 20k miles on it,was only 3 years old,I was the 2nd owner,and took impeccable care of it.
The problem with these cars is that when younger owners get ahold of them,they DESTROY them. They're amazing,rugged,and dependable cars as long as they're not abused by teenaged owners.
I'm guessing the one you're looking at is either an SL or a base model. The SL will have leather and chrome plated wheels,whereas the base will have alloy wheels and cloth.
The VR4 (especially the Spyder) is a VERY collectable car,and they're rare as hen's teeth. Mint condition ones still fetch $$$$$$.
The one issue I can tell with the one you're looking at is the notch shifting. They're supposed to shift smooth as silk,with no notchiness. It may just need a tranny fluid change with a good GL4 75W90 fluid. The smoking is from the worn valve seals.
Also,mine preferred dino over synth. I wouldn't even consider running synth oil in this car if you decide to buy it.
I traded my 96 for the 98 when it had 135k on it,and it still ran and handled showroom fresh. Got bored and traded the 98 for my current Z32.