AD&D 1st/Basic is me too. I don’t think I ever have ever even seen the original white box. Still play occasionally. Have you checked out the ‘old school renaissance?’ Holy cow what is old is new again. I take it they use some type of free license to reproduce the old rules. Then they put out their own stuff for free or sell it. I guess it would be like if monopoly radically changed its rules but some still liked the old way and players supported that rule set.
As far as the later editions its what ever trips your trigger, I have no first hand experience with it. Sounded pretty far removed to me I guess.
Freegards
Yes, I've played quite a bit of the OSR stuff. It's generally based on Third Edition or 3.5 because Wizards of the Coast (who own D&D having bought TSR out of virtual bankruptcy) introduced the Open Gaming Licence for those two systems which rejuvenated the game incredibly by allowing anybody who was willing to follow the licence to publish material on a for-profit or non-profit basis. And some people came up with ways to create a 'First Edition Feel' game under that licence. OSRIC is my favourite example.
Wizards have now seen the light to, and core rulebooks from 1st, and 2nd Edition, and the old White Box have recently been reprinted, too - they finally worked out that they were losing money by not selling these. They focus on their new editions, but why not sell the old to those who want them as well?