If your buying a bike specific for track use, then you don't need to worry about getting it titled. This is good, as you won't need to pay the premium for the title. Of course without the title the resell won't be as much, but hey, it's all for fun.

Now you can pick one up in the US, and save yourself the head ache of dealing with shipping, customs and dealing with a foreign seller who could possible screw you. Keep an eye on the classifieds section here, eBay, the different web sites/forums for race clubs around the country, and other websites/forums centered around motorcycles. They come up for sale pretty often.

An NSR and VFR/RVF are pretty much the same size in terms of seat height, so getting one over the other isn't going to make it more comfortable for taller/shorter people. As a track day bike, they should both be pretty equal in power.

An NSR will go a good distance in stock form with the work to derestrict it. I ran my NSR at race pace with track days in between the race weekends for an entire season on one top end. Never had a problem with it. I think I put in over 35 days on the track with it last year. A rebuild cost be about $250.00 for the top end rebuild (maybe more, but under $300.00 for sure).

Getting a Honda TS or Yamaha TZ250 will mean more work over all. They are not the best selection for track day bikes, and are geared more towards racing, and the commitment one puts into racing it. With top end rebuilds at 300 miles, cleaning power valves each time, cleaning exhaust of carbon each time, constant checking, rejetting depending on weather (sometimes three times a day), the cost goes up in terms of annual maintenance. I don't even want to know how much I spend on my RS250 over a year, cause I would probably check myself into a mental ward if I did. for the most part, once you get the NSR setup properly with jetting, you can set it and forget it. I ran my NSR all season after getting the setup correct. Never had to rejet and rejet again...

Oh ye, fuel. The NSR will run fine on 100 octane fuel with a good grade of 2-stroke oil. The RS... race gas at $7-$10 a gallon, with $80 a gallon oil. At a burn rate of 1 gallon every 20 minutes? Yep, NSR is the more economical choice

Even jetting an RS rich, you will still need to do top ends more then the NSR. You will also eat more fuel, and oil. Oh, and you will also foul your $30.00 spark plugs more (compared to the $9.00 NSR plugs).

All in all, your better choice for a track day bike would be a NSR or other street based 2-stroke (TZR, RGV or Aprilia RS).

Of course this is based on my experience, and opinion, so others may disagree.

thanks,
_________________
Charles Gallant