First of all, if the account was actually SOLD to Arrow, the original account/First Premier should show as a zero balance and as a charge-off. If it doesn't, then you need to dispute it!
Second of all, personally, since it should fall off your reports by '09-'10, I think I'd just leave it alone -- unless you NEED it to be gone via PFD. You could always take the $$ you'd use to pay the thing off and get a secured card with it, which would help you rebuild your credit!
Third, chances are, that CA account isn't hurting your score as much as you think (at least, I don't THINK it would be). COs and CAs are supposed to hurt less and less as time goes by. So even if you do get it removed, I don't think you'll see an astronomical point rise -- at least, IMO, you won't get the same "points bang for your buck" that you would if you just plunked that cash onto a secured card.
Fourth, if you do settle with Arrow and they DO delete, the original CO and the accompanying lates will still remain on your CRs. Arrow can only delete their TL with the CRAs ... they have NO power over the OC.
And fifth ... good luck!! I'm crossing my fingers for you!!