I think this is a pretty clear Rebuild rush board. Usually this means you can pretty safely ignore all trashing, because you don't particularly mind any of your starting 10 being there. You want to get rid of Hovel, but you probably get rid of it anyway because of its own ability, and you might want to get rid of Necropolis, but the Coppers aren't awful and you actually want to keep the OGE around in order to Rebuild it into an Estate. Getting one Masq might not be the worst play ever, but I would personally just open Silver/Silver or Silver/Fortune Teller over Masq, and you most certainly don't want two of them.
Buying Estates is good when there's a good reason to believe that you can Rebuild it into a Duchy before the Duchy pile runs out (which is hardly ever in most games, but it would've been true here), and in the end game where it prevents your opponent from ending the game on a win (also would've been true here).
