Probably not going to be worth spending the extra 700 bucks for that CPU right now, as the broadwell specs were just leaked, you're basically paying $700 for an i3's worth of extra performance, aside from the PCI-e lanes which you probably don't really need given that you're most likely only going to run a single GPU
anyways here ya go, case is just a personal preference but it does give really good air flow and gives you some hot swap hard drive bays for archiving things, just don't actually hot swap them most likely, but it includes a Firepro workstation GPU, just double check that your software can actually make use of the workstation GPU features
Could also grab a secondary display with the extra cash or just hold onto it
Are you buying in the US or another location, are you including display, and can you wait for Broadwell-EP which is announced but not yet available for sale?