Wow, great find and I know you must have gotten a great deal if you are considering selling the car. Buying another NSX with higher miles mmmmmm - I don't know about that. Higher miles as in what - 100k + - wouldn't advise it unless you buy a later model NA2.
What you are proposing and i'm reading between the lines, is to sell a car to get additional cash to buy a higher mile car that will need maintenance. The car you have needs maintenance. Read the ad carefully for the car with 53 miles on it. He just put 4000 in it to make sure it was road worthy after it had sat for years - just like yours has sat for years.
So now you want to sell this pristine car and make a few bucks that you'll turn right around and spend on a high miler.....that makes no sense at all. Your neighbor will also most likely wonder why they sold it to you! Who cares some say - well it's your neighbor and your conscience - but it seems kind of funny to sell a pristine 93 and then buy another black one to cover.....or something like that. I'm sure all this has crossed your mind.
Anyway, high mile 91s need lots of stuff if not much has been done and you'll have to find a high mile early car. Most sell high mile early cars cause they are tired of putting money in them and haven't fixed everything and want to dump them with few exceptions.
So what could you sell this 7300 mile car for - that's a good question - immediately you'll get beat up for at least 4 grand cause it needs a bunch of maintenance that has been derferred since it was bought and believe me there is at least 4 grand worth of stuff most here would recommend. Unless the prospective owner intends to put it up on blocks and wait out the next 10 years - mmmm - questionable. So could you sell it for 40k - maybe whatever you decide you might get for it you'll end up deducting 4k. So let's say you get 37k for it - now what - put 12 grand in your pocket and buy a 91 with high miles for 25k - gonna have to be around that unless you really find a dog that needs a ton at around 20k or less and then you get into salvage type autos. You'll be sorry if you do that!
You are a student on a budget and can't really afford this car but somehow have scraped up some dough to buy it at what I imagine would make everyone here go Kookoo! Ok - so you make 20k right off. Man I hate to be a bring down but 20k will buy you nothing but trouble. So don't think your gonna make out like a bandit on this thing, put all your money back in the bank that you paid for the car and then take only the profit and buy what most would call a crapper and drive off happily into the sunset. You need a good dose of reality. No disrespect intended. But we have kind of "been there and done that" in the collective here. So start thinking what kind of car can I buy for the difference and if you can't afford to put some good bucks with then wait till you get out of school, get a job, and then pay for a nice car - othersise you are just spinning your wheels.
This car is the one you would want if you could afford it - work thru it - keep this car - it is a wonderful opportunity to have and keep a truly rare find. If you sell this thing thinking that you are going to walk off with loads of cash and be able to buy something that would REMOTELY resemble what you just sold for half the amount - you are truly mistaken.
Keep this car - don't mod it up with stuff like hoods and wheels - make subtle mods you can't see - like get rid of the "boat anchor" they called an exhaust header in the car and find a late model exhaust header off another NSX. You will find after driving this beauty for a while that it needs things. If you can't afford them - put it up on blocks - keep it in a conditioned place and don't drive it till you can afford it. But deals like the one you stumbled on DO NOT COME ALONG VERY OFTEN! They may for you never come along again in your entire life! This is YOUR golden opportunity to have what others here would love to have. Well most that is - a true low mile pristine expample of an NSX and 93 is arguably the best year of all! Some here will try and weasle it out of you - don't let em do it. Take your time, keep reading, get thru school, and keep this car cause if you don't you will regret this decision for a LOOOOOOOOONG time!
Good luck! All the best!