Those brands are considered "Rolls Royce" where I am.
I'd also look at Cooler Master and the Corsair Obsidian range of cases. Although cases are a matter of taste I don't think the Gigabyte case is a patch on the ones I've mentioned Newegg.com - SILVERSTONE TJ07-BW Black Aluminum ATX Full Tower Computer Case
$349.99 is a lot but you get what you pay for.
I think everything else sounds great apart from the monitor. It's a TN panel. If you really want true colour quality look for a (H)IPS panel. These can be found on the Dell Utrasharp range,
and the NEC Multisync monitors- NEC EA231WMi review - FlatpanelsHD
being a favourite
Also this is a little gem ;Amazon.com: Dell UltraSharp U2311H 23-inch Widescreen Flat Panel Display eIPS 1080p LCD Monitor w/ DVI & DisplayPort: Computer & Accessories
The beauty of IPS is incredibly vivid colours and the fact that you have a much wider angle of view without the darkening or colour change you get with Twisted Nematic panels.
The monitor and case are going to be with you long after you've upgraded the internal components of the pc. Also the monitor is the part you look at everyday so it's got to be good
This sounds like a great build. Keep us informed of your decisions, John