Well let's see the '01 750 is carbs and hoop style rear end...the 02's get the immobilizer and st based frame with tie rod rear end, fuel injection, and a little less trail and 1 degree steeper head angle?
Any mods? Warrenty? Through a dealer? Got service records on all bikes? Is resale price important? Don't know how much difference there would be actually.
I would say as long as they have been maintained properly feel free to save the grand. Depends really if you want to have carbs or f.i. with an immobilizer system. If you end up with either of the '02's make sure you get all the key's for the said immobilizer system or it could cost a lot.
you can check parts and manuals here to see the differences.
http://tinyurl.com/2lu65
Anyways out of the three I am sure one must be talking to you...
I wouldn't sweat it. Good luck.....enjoy.