Agreed. Martinez was just one of those "hard to miss out on" talents - but I (think) said, even back in those days - Martinez would have been a more difficult fit next to Carrick, as they almost do the exact same job, albeit they go about executing it in different ways.
Herrera, to me, was always the better fit next to Carrick. But I do think our club's valuation at 20M is right - if we weren't operating in the current market, adding on the "Basque" only tax, we're looking at around a 25M player. But what throws it, is that the current market is skewed. I don't think Fellaini's a 27.5M player (neither did his release clause apparently) but in our team - he might prove to be worth every penny. Which is the opinion I had on Herrera.
Anyway, I hope he has a stunning start to the La Liga campaign and we're back in for him in January, after selling some dead wood in our squad. (cough *Young, cough *Anderson)
I remember skimming through there and reading a "Sunday Gossip" - City were interested in Herrera and he was valued at 16M GBP around a year ago.