Well, as much as I would like to see some new great striker in the team, personaly, I don't see it coming.
Crespo will probably leave, but Adriano will be back for sure, and I don't think he will be sold after a loan spell just yet(if it's ever gonna happen). And with all Morattis love and stuff... not gonna happen I think.
Cruz will stay as always, as super sub, and Suazo won't be sold after just 1 season, even if he didnt rise to the expectations.
That leaves 1 spot, and I think there might be a scenario, where Balotelli will come up to this place, seen him starting a lot lately(even CI, still counts), and doing a lot of training with a first team. It is still 5'th place, the lad won't be playing very often, and can get use to the first team regualary, and learn from the best.
And there is still Recoba, don't forget.
If not... then yeah. We certainly need 1 additional striker.
But for me, it's 2 times more important to get a player who will excell in the Figo position. It will be a crucial whole in the team for us next season if we won't deal with it. Diego, or someone of his standard is needed here. We are playing different since Figo got injured, and we need a player like him bad. Jimenez has great pottential, but his characteristics are different.