I've got a 92 750 nighthawk, for your first bike it'll do fine. With a stock exhaust and stock carburetor jets it won't be too much to handle if you're careful. There aren't many adjustments to be made on one of these bikes, cam chain tensioner is hydraulic and automatically adjusts itself once the bike is warmed up and running, electronic ignition system has no adjustments, you'll have to learn to maintain a drive chain but thats no biggie, Tire pressure, change oil and filter and spark plugs and air filter now and then too just like any other bike, other than that it's an apliance. You can put hundreds of miles on one every day without much worry. Mine has 45K miles on it and as long as it has enough oil in it, it's happy. (previous owner was unkind I think) I'm still on the original clutch at 45K. Get one with a center stand if you can. 2 grand seems a little steep though for a 92 since they made them until 2003 and there are plenty of younger bikes available. I've seen a few 200-2003's in Boston craigslist with rediculously low mileage going for $1600 or so. 2 grand for a low mileage, gently ridden, cream-puff isn't totally out of the question though if it's got newish tires/chain etc.
I wouldn't call it a cruiser or a sportbike though, it won't handle like a sportbike or be as comfortable as a cruiser. It's a very capable all around bike though and depending on the style of riding you want to do it can be outfitted for touring, can be modified for light adventure riding, or can be made more sporty to some extent.... Sort of along the same lines as a sohc 750 can be.
Parts availability is not even a concern yet, these bikes also had a long production run and all parts are still available new from honda. The 81 had some unique parts and that style of bike was only from 79-82
