Rooney
Aguero
Henry
Ronaldo (fat 1 but only good till about 25ish)
Eto
Imbrihimovic (how ever you spell it)
Benzima (Only 22 on mine and coming on nicely)
Torres for me is just immense, can beat anyone and score from nearly anywhere. But he's been in my first XI every season, if you signed him I doubt he'd be as good.
Of those you said, the ones I've had:
Rooney - very very good - so powerful and all round brilliance. And I had him up front with Torres, was great.
Aguero - good finished, but lacks strength, didn't workj for me on PES2008
I'd recommend Agbonlahor, Gervinho, Laudrup (actually nearly every legend), Rowland and Chapi (although the PES2008 version of Chapi I don't think is as good).