All Windows Phones should be getting Mango, and soon (I have it on mine), there's a few handsets out there that may take longer, a few of the weird Samsung Focus things with slight different hardware revisions caused a hold up last time.
No, no Skype support yet. But it is on its way.
I love my Windows Phone, I come from a Windows Mobile and Android background. Loose a lot of the tinkering, but maybe in my old age I can't be bothered faffing about.
HTC HD7 here, I've been buying HTC's since the SPV C500 (at least what Orange called it). HD7 is definitely cheaper made than the HD2. But it's still fairly solid, after a year the chrome finish on the buttons have started to wear through, but its still working alright.
My old man has the LG Optimus 7, apart from getting a faulty one, that took em weeks to get fixed it works alright, but obviously looks a bit chunky but it is solid and the battery life is better than the HD7.
Few work colleagues have the other HTC phone, Trophy I think and that seems alright too.