Probably get slated but...
I'd like to see us bring in a couple of premier league has-beens (bare with me). Young squad, with plenty of energy and enthusiasm, I'd like to see us bring in some older heads who have been there and done it, if nothing else to act as a reminder to the young players that football careers don't last forever and they should make the most of it. The main reason though, is that they can issue the orders of the pitch, organise and continue to develop the younger players. Admittedly this system won't bring overwhelming success, but I would hope with the right players we could secure a comfortable position, and then with the younger players maturing and benefiting from working with experienced pros we could push on in two or three years. I know in the past this hasn't worked, with carsley and de zeewu, but Kevin Phillips is a prime example of what can be achieved.
The issue of course would be high wages, older players looking to cash in late on in their careers. However these are also the sort that should be avoided. You want players that love football and are still hungry and the money is just a bonus. Prime example would be Salgado at Blackburn, read his column in fourfourtwo and he's a top bloke, loves football, wanted a new challenge and he's not precious enough to think Blackburn are beneath him.
Example players;
Robbie Blake (36 years old)
Rory Delap (35 years old)
The above I would consider realistic, if personal terms can be agreed.
Some slightly less realistic targets I'd love to get
Akos Buzsaky
Zak Whitbread
Sean Davis
All three available on frees