ok - i made the change.
i sold FO3 a few months ago just because i had recently bought FNV. FNV was a very good game - and i was lucky enough to experience very few of the widely-mentioned bugs...but i just didn't love it. i had played 160 hours on FO3 on just one playthrough, and also got the broken steel DLC.
This week i made the change back - so now my FNV is up for sale on a well known auction site, and i was lucky enough yesterday to receive (from the same auction site) a copy of FO3 GOTY (with all the DLC's included).
so...back to the wasteland to wander aimlessly...and loving it again already!