Case and Power Supply help for new PC build

Hi All,

So far these are the parts I have looked at newegg for a new PC:

Approximate Purchase Date: e.g.: May be in a month


Budget Range: Dont have a budget really but I dont want to spend more than $120 for a motherboard.


System Usage from Most to Least Important: Store photos,Internet browsing, Playing Microsoft Flight Sim, May be use photoshop to do some photo editing.



Are you buying a monitor: No


Parts to Upgrade:

Media:
Samsung DVD Burner - $18

Hard Drive: $110
Western digital 2TB

RAM:$46
Kingston 8GB 240 Pin SDRAM DDR33 1333

MOBO: $134 ( - $15 rebate)
GIGABYTE GA-Z77X-D3H LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

Processor: ($189)
Intel Core i5-3330 Ivy Bridge 3.0GHz (3.2GHz Turbo) LGA 1155 Quad-Core Desktop Processor
Intel HD Graphics 2500 BX80637i53330

Total Cost with extended warranty and shipping : $605.75



Do you need to buy OS: No



Preferred Website(s) for Parts: newegg.com


Location: US,Florida


Parts Preferences: by brand or type (e.g.: I would like to upgrade to Intel CPU)


Overclocking: Not really concerned about it


SLI or Crossfire: I don't know but what is the use of this?


Your Monitor Resolution: Not sure but using my existing monitor


Additional Comments:


And Most Importantly, Why Are You Upgrading: Just replacing an older PC and need to get a new one which is faster.



Now will a mid ATX case be good enough for this and how much power supply will be needed for this?



Now will a mid ATX case be good enough for this and how much power supply will be needed for this?




Thanks!