Questions about HP P6813w upgrading (PSU and graphics card)

Since certain people want to be pissy about this I'm asking this question that ANOTHER person has already asked. I want to be able to play The Sims 3 in addition to it's expansion packs on high setting (the non-online game).

I know I will have to pay for another psu and a card so here are my thoughts, I know I need help in choosing a psu and this following link is the specs for this tower HP p6813w. Mind you I am not computer smart but I know little tid bits. I'm clueless as far as picking a psu to power a decent card. my limit is around $100.

HP Link: http://h10025.www1.hp.com/ewfrf/wc [...] ct=5117357

PSU options?:
SILVERSTONE ST45SF 450W SFX12V 80 PLUS BRONZE
http://www.newegg.com/Product/Prod [...] rue&Page=2

Diablotek PHD Series PHD450 450W ATX12V V2.2 Power Supply
http://www.newegg.com/Product/Prod [...] 6817822002

Graphics Card:
GeForce 9800 GT 1GB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
http://www.newegg.com/Product/Prod [...] 6814187163
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More about questions p6813w upgrading graphics card
  1. I have the same computer and found many PSU wont work with this computer.
    It needs a 4 wire plug to the motherboard that many PSUs don't have.
    They have a 4 wire plug with the 20 wire plug, but it won't work on my computer.
    I got a Thermaltake TR2 600 W and it works very well.
    It powers the big bad graphics card I just put in.
    My new graphics card is a Radeon HD 6770.
    It is working great and video game frame rates are much faster.
    Even playing on a 46 inch HDTV at 1900 x 1080 res.
    It looks amazing.
    I am sure this PSU will handle many different graphic cards.
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