Sorry to hear this, I know exactly how you feel - well worse as we got broken into for the key.
Be careful buying anything until you have the payout, if the car is found before they payout then you could get the car back (if its not damaged or can be repaired).
They will tend to work on 'book' value - just had a quick look as I have access to Glasses,
2005/05 GTI 3Dr 2.0TFSI 73k miles (average)
Retail 6550 / Retail Trans 6330 / Grade Hi 4960 / Grade Av 4740 / Grade Lo 4480 / Trade In 4750
Good luck getting things sorted.