It's a CU24 Philly ;)
As Phil says, the blueish birds are the Artist Pack Pau shell. Depending on the year, it may also have a Brazilian Rosewood fingerboard. Looks like it's a fairly new guitar to me, and I think it might be one of the rarer ones with an ebony board.
Artist Packs have 10 tops Adam, and the uniform flame across the top looks good enough for a 10 designation to me.
I'd say the price was about right. Here's similar one for £1899: http://www.guitars4you.co.uk/guitars/1856.htm
Possibly an AP, going on the gold hardware (unless it was custom ordered on with a 10 top). The birds do look kind of Paua, and it's got old birds so pre 2008. I'd make a call that it's a pre 2005 Artist Pack, if only because the board looks more like IRW then Brazzie. Doesn't look like a 2008 ebony, birds are wrong and there's none of the figuring that maccassar ebony has. Nice flame so yeah, 10 or AP. It's not, IMO a private stock grade top.
Oh, and the Artist grade tops are supposedly > 10 tops. I haven't ABed myself, but the only PRSi I've owned are APs. :D I'm pretty sure that the reason the AP was discontinued was because PRS could no longer source the tops consistantly enough for production guitars.
The headstock would explain a lot! :) The back as much as the front. Private Stock are signed & numbered on the back, 10 tops have a 10 written on the bottom point, and Artist Packs do not have the 10 designation. Another note on the headstocks - the front of 10 top headstocks match the body colour, the Artist Pack ones are veneered with the same material as the fretboard and have a Paua signature, not gold printed.
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