Real, Barca, Bayern, Chelsea, United, Arsenal and Inter (who were also in for him) could have afforded him. In his biography he says he was impressed with Mancini and City's desire to land him.
Yes he'd done brilliantly well at Atletico, but lots of forwards have done well with Spanish clubs and flopped elsewhere. Since joining us, he's repeated (and bettered his record) and his status has skyrocketed. I seems like a bargain now, but then it was still a pretty big signing with fingers crossed that he could cut it in the PL. Thankfully he did.
Soldado had a higher scoring ratio than Aguero, and he didn't work out so well. I wouldn't like to say we got 'lucky' with Aguero, but I would say it panned out bloody well, and arguably better than anybody imagined.