[Solved] Gaming rig trying to stay at $500 mark need a little guidance please

Hello everyone, first off thanks for taking the time to help a gal out here lol^^ this is my first attempt at building my first PC, i have became a little intimidated with what is compatible with what and so on, if someone was able to hand over a box with parts guaranteed to fit together i could surely put it together, you give me a empty box to buy the parts i would prolly just crawl in the box and hide lol. So.. this is what i have came up with and I'm not 100% err even 45% sure this stuff is compatible but I have tried so hopefully i don't embarrass myself to much. , i read a previous post about the 500 gaming rig and that's about my budget, but found a few different parts i would like if they end up working with everything else i picked ><.

APPROXIMATE PURCHASE DATE: this week or asap BUDGET RANGE: 500ish After Rebates

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: gaming(world of warcraft, sims, civilization), Photoshop Cs4 (mainly photo editing) surfing the internet, watching movies

PARTS NOT REQUIRED: keyboard, mouse, monitor, speakers

PREFERRED WEBSITE(S) FOR PARTS:newegg.com, tigerdirect, amazon. Never had to buy this many pc parts at once so not really picky of store, just cheap and safe to buy from hehe. COUNTRY OF ORIGIN: USA

PARTS PREFERENCES: none really since I know no different >< Please recommend different if i have choosen something i can do without or have no need for ty

OVERCLOCKING: no preferance i think

MONITOR RESOLUTION: i use a viewsonic 22 inch at 1280x1024 res the most for gaming and such

ADDITIONAL COMMENTS: i dont have to have the best parts, as long as theres room to upgrade in the future, just mainly "more bang for the buck" at the moment for a decent gaming rig that i can do the above tasks
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I have compiled these parts all from newegg cause thats the store i have really only used for pc parts, so if theres better elsewhere im there! Keep in mind i mainly want to be able to play World of warcraft/sims/civilization and use cs4, so i dont really know if i have picked somthing "overpowered" & I hope i picked stuff that fits together if not i apologize for my stupidity, 1 day ill get it lol

Mobo/Cpu combo (save 15$ for buying as a combo) $196.99 combined after the rebates
ASUS M4A79XTD EVO AM3 AMD 790X ATX AMD Motherboard
AMD Phenom II X2 550 Black Edition Callisto 3.1GHz Socket AM3 80W Dual-Core Processor Model HDZ550WFGIBOX
http://www.newegg.com/Product/Comb [...] mbo.293453

OS/Optical Drive combo (save $8.00 as combo) $126.98
Microsoft Windows 7 Home Premium 64-bit 1-Pack for System Builders - OEM (can i even use the system builders version?)
Sony Optiarc Black 24X DVD+R 8X DVD+RW 12X DVD+R DL 24X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA DVD/CD Rewritable Drive
http://www.newegg.com/Product/Comb [...] mbo.282129

HD $69.99
Western Digital Caviar Black WD7501AALS 750GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Hard Drive -Bare Drive
http://www.newegg.com/Product/Prod [...] 6822136283

Case $79.00 (the case really dont matter to me if i can save a few bucks, i only picked this 1 cause it came with a power supply)
RAIDMAX SMILODON ATX-612WBP Black 1.0mm SECC Steel ATX Mid Tower Foldout MB Computer Case With 500W Power Supply
http://www.newegg.com/Product/Prod [...] 6811156062

Video Card$79.00 after rebate
PNY XLR8 VCG98GTEE5XEB GeForce 9800 GT EE 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
http://www.newegg.com/Product/Prod [...] 6814133279

Memory $82.99
G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Dual Channel Kit Desktop Memory Model F3-10666CL9D-4GBPK
http://www.newegg.com/Product/Prod [...] 6820231188

Total comes out to $634.95 which is a little over budget and not including anything else im not aware i need. So if you see anything i can go cheaper with or have no need for to do what i want to do please recommend it i would be so grateful ! Thank you soooooooooooooooo much again for your time have a great thanksgiving.

I would certainly avoid that Raidmax case and power supply. Either go with Outlanders choice or if you really need lower cost try this Antec case/power supply combo at $80
http://www.newegg.com/Product/Comb [...] mbo.288875