Just thought about this. Pretty difficult to narrow it down. I would have a couple of certainties and the remainder can certainly be dictated by preference, but there are several factors to consider alongside that.

1) Henry
2) Vieira
3) Pires
4) Fabregas
5) Ljungberg

I'd probably change my mind on that a few times. One really good omission was Anelka - sold off after a good season for £23m and never the same since, whilst paying for Henry and a new training ground.

Tried to think mostly of on-pitch contribution but it's hard not to be swayed little bit by the incredible profitable signings when putting together a list. Someone like RVP - bought for £3m, sold for £24m - falls under that. Even guys like Nasri, Overmars, Mong Billong and so on.

Thoughts?