Why don't you try selling those two guitars and then buying an R8 with the cash? That's probably your best bet. Reason I say that is because if you do find a possible trade, you're sort of limited to that one particular R8. Historics are incredible guitars but not all of them are incredible, if you know what I mean?
Personally...and don't take this the wrong way, coming from a guy who owns a LP Custom and owned an '06 Standard, I wouldn't even consider that trade.
LP Custom - say $1,700, 'cause of the mojo.
LP Standard - say $1,200, worst case scenario.
Total - $2,900. More than enough to buy you a used R8 and just on the low side of the R9 range.
Could buy yourself a used R8 with a small tube amp for that much. Like a Blackheart Little Giant.
