I also like Downing, but most people on here seem to think he's overrated. But at over £10m, which is steep, I think he's out of our price-range, at least for now (maybe in the summer things will pick up on that front).
Diarra at Pompey is an interesting one. Now that Harry has left, I think a number of senior players will want to follow that lead. Plus, didn't Diarra himself claim that he still wanted to be playing for a top club, that Portsmouth was effectively a stop-gap? But then are we a top club?
Downing is an immense player for me mate, i think hes worth droping about 15 mill on if we could afford it. The quality and creative outlet he would add to our side would be considerable and instant IMO. While he is also prone to scoring, it baffles me that some dont rate him. A really underatted player.
Some note worthy mentions to for me would be, De Guzman, Glen Johnson if Pompey are in need of money, id even try a sneaky loan move for Drethne at Real.