1. All of the cases mentioned are nice. I have a Li Lein 80B and a Antec 900. Big and roomy.

2. Seasonic and PP&c are top rate PSUs. Anything around 600W will run your system, until you get multi GPU like the X2s or GT295 series

3. I would not buy a combined Case/PSU deal. If you fine a combo with the parts mentioned, you would be ok. Most of the PSU in a deal are POS.