The negotiation phase of a transfer in world football can be tense, fraught and drawn out. Very rarely is a deal struck that leaves both sides feeling as if they got the upper hand.
Manchester United have made plenty of bargains over the past 10 years, luring players like Nemanja Vidic, Edwin van der Sar and Javier Hernandez to Old Trafford for relatively tiny sums.
Saying this, the club has also overpaid in the transfer market. The likes of Bebe, Dimitar Berbatov and Dong Fangzhuo come to mind in this respect.
Estimating a footballer's worth can be a tricky task—one usually based on age, contract length and the financial position of his club as much as on pure ability.
The Red Devils are likely to make several signings this summer, with Sir Alex Ferguson pushing for European glory in his final few seasons at the club.
Here is a look at United's top six transfer targets, with a bit of financial guess work used to determine how much they should pay for each.