Hi y'all,Just joined and I have many many questions.I am looking to purchase a new computer. I have always used macbooks and iMacs and am using a MBP with a 256 gb SSD.Here is my current build, if y'all give the ok this is what I would buy at those prices and at the associated links.My price range is not strict I do not mind spending up to 2000, but if you could explain WHY you would want to switch it to a better or worse part. Price is a very good reason along with your standard reasons.Lifestyle: Play some occasional sc2, have been playing on the MBP, but I never knew that 15 fps on a game is bad... So decided I wanted to switch. Not looking to have the insane or best ever graphics, but want to be able to play any game comfortably in the next 2 years. Apart from that I simply use the computer for basic word processing and enjoyment.----------------------GPU: EVGA GeForce GTX 560 Superclocked 1024 MB GDDR5 PCI Express 2.0 2DVI/Mini-HDMI SLI Ready Graphics Card, 01G-P3-1461-KRhttp://www.amazon.com/gp/product/B0050I1PH4/ref=ox_sc_act_title_1?ie=UTF8&m=ATVPDKIKX0DER - $198.86OS: Windows 7 Premium (wish I could get Lion) Should I get ultimate?Amazon.com: Windows 7 Home Premium SP1 64bit (Full) System Builder DVD 1 Pack: Software - ~$100CPU: Intel i5-2500 K. Should I get the i7?Amazon.com: Intel Core i5-2500K Processor: Electronics - $213.32Tower/PSU: Antec Sonata III 500 Quiet Super Mid Tower ATX Case (Black)Amazon.com: Antec Sonata III 500 Quiet Super Mid Tower ATX Case (Black): Electronics - $119.99CD/DVD/Blu Ray: Pioneer Blu-Ray Drive-Rw/Dvdrw Bdr-206bks 12x Sata With Software Brown Box Excellent Performancehttp://www.amazon.com/Pioneer-Drive-Rw-Bdr-206bks-Excellent-Performance/dp/B004GG0KF4/ref=sr_1_1?m=A1W6N3P2KQY7LM&ie=UTF8&qid=1337903826&sr=1-1 - $163.99ORSony 24X SATA Internal DVD+/-RW Drive AD-7260S-0B - Bulk (Black)Amazon.com: Sony 24X SATA Internal DVD+/-RW Drive AD-7260S-0B - Bulk (Black): Electronics - $24.99RAM:8GB Kit (4GBx2), Ballistix 240-pin DIMM, DDR3 PC3-12800 memory module CrucialCrucial Website: BLT2KIT4G3D1608DT1TX0 - 8GB Kit (4GBx2), Ballistix 240-pin DIMM , DDR3 PC3-12800 from Crucial.com - $63.99Sound Card:Creative Labs SB0880 PCI Express Sound Blaster X-Fi Titanium Sound Cardhttp://www.amazon.com/gp/product/B001E25KDK/ref=ox_sc_act_title_2?ie=UTF8&m=A3LJ5WMKNRFKQS - $96.99HD: Western Digital Caviar Green 2 TB Desktop Hard Drive WD20EARXhttp://www.amazon.com/gp/product/B004VFJ9MK/ref=ox_sc_act_title_3?ie=UTF8&m=ATVPDKIKX0DER - $119.99Motherboard: Very very confused as to what I should get. Are ALL motherboards compatible with every part? obviously there are intel/amd motherboards but not sure at all what to get. I understand that you have to add up all the PCI connectors and make sure you have enough which I have at least done at my part. But beyond that I have no idea.Have always enjoyed Asus as great products as it was my first notebook. Looking at these two MBs.ASUS P8Z77-V PRO LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboardhttp://www.newegg.com/Product/Product.aspx?Item=N82E16813131819&Tpk=13-131-819 - $209.99MSI Z77A-GD65 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOShttp://www.newegg.com/Product/Product.aspx?Item=N82E16813130643 - $189.99Belkin Anti-Static Wrist Band with Adjustable Grounding - Safetyhttp://www.amazon.com/gp/product/B00004Z5D1/ref=ox_sc_act_title_6?ie=UTF8&m=ATVPDKIKX0DER - $7.50Total Costs: $1345.61- $1484.61 with blu rayAlready have the best peripherals and screens.Questions:1. What is the difference between a full tower and a mid sized tower? Do i need to purchase a seperate psu? It already comes with one. 2. Is building the actual computer difficult technically? Would you recommend simply buying one from ibuypower etc? I have done basic ram upgrades, and SSD upgrades on macs only.Thanks!