LOL np man. Thanks for clearing it up. I want to thank everyone else too. I think The Gtx 750ti would be the best option until I am done with my studies. Hopefuly Electrical Engineering can teach me some more about this computer stuff. Specially the internal areas.
PC knowledge is really just PC Knowledge. I had engineers, computer science majors, etc. and 95% I knew in college didn't know much of anything about PC Hardware.
300W is what Nvidia recommended. Then everyone just simply ignored that and wrote 400W.
I personally don't like to cut it close though but that's up to you. After blowing two sets of tweeters on my Polk Monitor 70 Tower Speakers, having power issues on my last PC due to a weak power supply, etc. I will never underpower something again.
It SHOULD work for you 99% of the time though.
As for locations to purchase. When I said never walk into a bestbuy again I wasn't kidding. Amazon.com and Newegg.com are there for a reason.
I just have to reiterate since I hate seeing people throw away money. It's like the biggest pet peeve of mine. My friend was in the same type of situation you were in and I helped him through that and he is getting his PC today (he still insisted on having a local shop build it but at least he didn't go with the rag tag group of parts he picked. His PC Shop didn't know that some intel CPUs don't have integrated graphics...).
Your current PC has VERY little future value.
You spent $600 and are going to FURTHER sink another $150 into a graphics card. 2 years from now, that PC/GPU will be hard to off load, and won't perform well in new games.
Meanwhile you could sell your current PC for $450, after you purchase your new PC for $1k, and get 4 years or so out of your new PC easily.
Users who spent $1K in 2010 now in 2014 only need at most a GPU upgrade to stay relevant(There are tons of happy Nehalem users gaming on OCd chips).
Yourself you've spent $600 on your PC. Now you are going to spend $150 on a GPU for a total of $750 spent. Except your system has MUCH LESS longevity.
Your current route:
Spend $600 PC
Spend $150 on GPU
1-2 years from now (When your PC has depreciated like no other) sell your PC. The only part worthwhile will be the GPU since in reality the only reason your PC is easy to sell right now is that it's relatively new so you can show someone the link and be like "It's $600 and I just got it but I'm upgrading so I'll give it to you for $450!!!!" 1-2 Years from now? Probably get about $200 for it but I'll be generous and say $375. Then purchase a whole new PC for $1k and get 4 years of quality gaming from that.
Total Spent: $1750
Total Recouped: $375
Net Spent: $1375
Years of Quality Gaming over a 6 year Span: 4 years
Proposed Route by Groover:
Spend $600 PC (Already done)
Sell PC $450
Purchase new PC $1k
2 years from now sell your GTX 770 (You can get $200 for it? You can sell it later though but for purposes of keeping both routes even).
Purchase even better GPU $350
Total Spend: $1950
Total Recouped: $650
Net Spent: $1300
Years of Quality Gaming over a 6 year Span: 6 years
It just makes more sense to buy what you actually need now rather than try to bandaid it. Don't hold onto hardware that doesn't perform/do the task you need. Always sell it as soon as possible.