Mr Op Sir?
What's that? I think a case suggestion and any future upgrades would be handy
Well you're the op, so I thought 'mr op sir'
And future upgrades... err... well, apart from another 4gb of ram, an ivybridge i7, and a second 6870 further down the line, there's not really much else (apart from ssd's)
But depending on how good sandybridge-e is, and what other new processors and ram types, as well as graphics card families etc are released, your upgrade plan might change considerably
And as for cases... well like I said, its down to personal taste. But anything made by coolermaster, bitfenix, corsair, lian li, lancool, fractal design etc will be fine.
Just avoid the cheap brands with no pedigree.
Also antec cases like the p180 are nice, but other antec cases (particularly the old 300, 600, 900, 1200 etc series) I would avoid because there are far better for the money, and in the flesh they look cheap and horrible. I can't comment on the dark fleet cases cos I've never owned one or seen one in the flesh, but they have good and bad reviews around on the internet.