Man that's wild...10% of your budget on a case.I really like the Obsidian 900D, I think I'm gonna stick with that.
Whatever works for you though.
I mean with 3K its even tough to recommend parts...you pretty much can buy whatever you want. However, I would probably suggest a tonymacx86 compatible gigabyte motherboard in case you ever want to take the hackintosh route...you will have a complete PC from any single angle you look at it. Do you want a blu-ray burner?