How long are you keeping this build? If it's for a few years, look at the X38/X48 offerings. i.e. GA-X38-DQ6. If it's a placeholder until Nehalem, look at the budget P35. i.e. GA-P35.DS3L or DS3R with RAID.
About cases, do you prefer blink to functionality? Or the other way around?
As for good psus, pick out a tier 1/2/3. Look at the side of the box or specs under sys. req. of the card for the wattage. 350w minimal for 8800GT. A 450-500W will last a few upgrades.