Regent Sound in Denmark Street had a nice brown one two weeks ago, much nicer than the one that was there a couple months back when I bought my red one. I used it to try an AC4TV, I was probably playing it for 20-30 mins, and then I suddenly realised I'd switched over to trying the guitar not the amp!
They seem to be doing reasonably well for turning stock round though - and it is the christmas period now - so whether it's still there is debatable...
Even with what I'd call a good one, I suspect it won't really shine until you've had a decent fret-dress and set-up though. I'm happy with the way mine plays, but I suspect that someone else might think "don't you want the frets crowned??!"
Btw - I'm not convinced there's much in the way of neck dive at all on mine. Might have got used to it though so don't notice (and I'm at work so can't test it...)
AND!!! A big happy birthday! :D