I'd be happy with Silva, personally. Fonseca does look impressive as well. I think Silva needs to find the right club to settle at, and build something with. We have money, and a decent squad (as demonstrated yesterday), but we need a clear direction and something to get behind, and I think Silva is the kind of candidate who would relish the challenge of taking us forward.
I understand there are some misgivings, and some of them are legitimate (in my view), while others aren't. Comparisons with Martinez (because they're both Iberian) are cheap and lazy, so I've got no time for that. But I do think it's reasonable to question the way he's moved around a lot, and also to question the way things went downhill at Watford.
But overall, from watching his teams play (and in my view, overachieve), and then reading about his tactical knowledge, his attention to detail and the devotion his players have shown towards him, I think he's an impressive guy who will eventually settle somewhere are do really, really well and hopefully that could be with us.