i was looking at this a few years ago for work when the expressions of interest were released and the auction processed was announced. the popular stuff was always going to go for a metric tonne of $. a few of the gTLDs we were looking at were approaching 80-100K.
theres more than a few places block buying them. you can always try and buy them off them but it might be more than a LOLz worth of cash.
I gave up when I tried to register gronk.sexy for my mates surfing blog and it was taken. Makes me think its gonna be hard to get less than a 6 digit domain.