I admire your faith in Peco/Kato, but given what we've seen of the George Englands I'm not so sure. Outwardly they are lovely looking little things, but the use of generic tooling for both locos, traction tyres and no DCC socket make me Fairlie (sorry) sceptical that their Double Fairlies will be anywhere near the quality of these ones. It is possible they will be competitive price wise but quality/detail wise I highly doubt it. I will still be buying the Englands but I'm definitely not blind to the flaws the models have.
And on the price front I can't see them being that much less than the Bachmann ones. Double Fairlies are complex locos and that is going to translate very quickly into tooling and manufacture costs. Considering the complexity of the prototype and the fact each model seems to have unique tooling, the fact Bachmann are charging £235 RRP (£199 at most retailers) I think is actually pretty good.