Just a point of reference, I bought my 97 NSX with slightly less 13,000 miles about 15 months ago for $50,000. I thought it was a little on the high side, but I really wanted a yellow 97-01 yellow NSX, so I didn't mine paying a couple thousand over what I thought is worth. Beside, my NSX was about 60 miles away and I don't have to pay for airfare. No headaches and seller gave me a 2 inch thick manila folder with all maintenace records, and history of all items purcahsed for the NSX.
$49,900 for a 98 yellow NSX with 38,000 miles is not too outrageous. If the car is in good condition, and you really want a yellow NSX, I would serious contact the seller and get the details. You probably can knock 1 or 2 thousand off the asking. If you wait another month, there will be more buyers to compete with. Yellow is a love or hate color (IMO). You either love it or you hate it. Yellow is too bright for most people. Are you man enough?:biggrin: :biggrin: :biggrin:
Good luck on your search, and post any details that you come across reagrding this NSX for other members.:smile: