Though I´ve only looked out for EB0/3´s the last years, I always check Grabber values/auctions when looking for Gibsons - as I´ve had a Grabber since I was 14. $1000 seems to be the average price these days. I´ve only seen one that was priced way too high, but it was wine red autographed by some Gene Simmons guy. I have a nutural, and wouldn´t mind having a black or red - but the autograph didn´t wash off so I let it go:-)
Seriously, I´d never part with my Grabber - it always sounds good whatever style. I have a mid 70´s P-bass too, had it for about 20 years, but never really liked it like I like my Gibsons (or even my rick). Guess P´s are fine, but I keep tinkering with it to improve it, so there must be something wrong with it! Maybe it´s a tad heavy and therefore not comfy, maybe
I´m just not a fender guy..