Please dissect my new pc so I can fix it/do better next time

Ok so here's the deal champs. This was my second attempt at a custom build. I thought I knew plenty, being as I did it once and the computer ran better than any other computer I used (but I don't have computer geek friends, so that is not saying much). Here's the tricky part: I started out with a low-end pc in mind, (amd x2 5000+, 65 dollar mobo, etc), but after talking to my brother the pc concept that I had in mind really got scrambled and I ended up trying to make a mid-range pc with a low-end budget (and I now realize it was foolish). SO, I need you all to sort it out! If I could go back in time I would have done this BEFORE (gasp) I blew all my moolah, but I believe that over the next 6 months I can fix my build into something that makes sense...but I need your help! And, I am confident that by fleshing this all out here that next time I won't NEED your help (although I think next time I will still WANT your help).

This is going to be used mostly for GAMING but I am POOR so I can't afford a proper gaming rig. I AM TRYING TO BUILD A PC THAT WILL RUN AS MANY GAMES AS POSSIBLE FOR AS LONG AS POSSIBLE WITHOUT GOING OVER $750 TOTAL (over the next 6 months is a different story). 640 x 480 is FINE BY ME so long as I can play the game smoothly.

If you want to be UBER tell me both how to fix my current pc (best bang for buck NOT HIGH END) and what you would have done with $750 in the first place

example:

Replace x with y but this is what I would do with $750
Ok without further ado:

Case: RAIDMAX Scorpio ATX-868WSP
link: http://www.newegg.com/Product/Prod [...] 6811156139
Power Supply: raidmax model rx-420k 420W
link: http://www.newegg.com/Product/Prod [...] 6811156139
Motherboard: ASRock P45TURBOTWINS2000 LGA 775 Intel P45 ATX
link: http://www.newegg.com/Product/Prod [...] 6813157133
CPU: Intel Core 2 Duo E8400 Wolfdale 3.0GHz
link: http://www.newegg.com/Product/Prod [...] 6819115037
OS: Microsoft Windows Vista Home Premium SP1 32-bit English 1pk for System Builders
link: http://www.newegg.com/Product/Prod [...] 6832116485
RAM: OCZ Platinum 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 1066
link: http://www.newegg.com/Product/Prod [...] 6820227178 (it was a one-day special at 36.99 FS)
HDD: Seagate Barracuda 250GB 7200 RPM 16MB Cache SATA 3.0Gb/
link: http://www.newegg.com/Product/Prod [...] 6822148262
Video Card: GIGABYTE GV-N95TD3-512H GeForce 9500 GT 512MB 128-bit GDDR3 PCI Express 2.0 x16
link: http://www.newegg.com/Product/Prod [...] 6814125228
Sound Card: Creative Sound Blaster SB0570 Audigy SE 7.1
link: http://www.newegg.com/Product/Prod [...] 6829102002
Burner: LITE-ON Black 20X DVD+R 8X DVD+RW...Burner with LightScribe
link: http://www.newegg.com/Product/Prod [...] 6827106265
Heatsink/Fan: http://www.newegg.com/Product/Prod [...] 6835186134
link: ARCTIC COOLING Freezer 7 Pro 92mm CPU Cooler
Thermal Paste: Arctic Silver 5 Thermal Compound
link: http://www.newegg.com/Product/Prod [...] 6835100007
-$10 COMBO DEAL AT NEWEGG HDD+OS

GRAND TOTAL $742.27 SHIPPED

THANKS IN ADVANCE

Six months prior to buying a new PC is about when you want to start reading up on the new tech stuff.
But its far, far too early to start to pick parts.

Your motherboard, video card and power supply are the weak links in the list you have now.
BIOSTAR TForce TP43D2A7 P43 MB $80
Antec Earthwatts 430 $30
C2D E7200 2.53Ghz CPU $120

Leave out the sound card & CPU cooler and we've saved $30 sound card, $27 CPU cooler, $50 CPU, $80 video card, $30 MB and $17 towards the case & PSU.

With that $234 get a better video card
HIS HD 4850 video card $155
and find a case you like for $79 or less. Or a $49 case and a $30 CPU cooler.

Well as far as upgrading, the best thing you can do to get better performance right now is upgrade your video card.

Other than that, your computer should play games for a while as it is provided the mobo and PSU hold out and everything.

hey, here's another thought: I see that no one is suggesting a good UPS backup device. Since I can get that over the next few months and since I live in florida where there is a lot of lightning, any recommendations on a UPS that is cheap but will serve my needs?