I've got my 781 on now. It's a great thing, I can't knock it. The movement in the newer model has been deemed better because it hand-winds and hacks but I can't say the lack of those features annoys me too much. I like the crown and dial on the new models a little more but I'm more than happy with my original and best.
Sometimes the love of watches is a completely irrational thing and while I agree the SRP309 is marginally better looking and has a more modern movement, I don't want one, I'll stick to my SKX781. You'll be lucky to get one new nowadays though.
Oh, that thing on the right, that isn't a Monster, I don't care how online retailers dress it up.