question about nvidia control panel and dirt 2

[kdfresh09]

alright so im test driving this pny gtx 470, and im wondering if there is anything i should tweak in the 3d settings in nvidia control panel, or just leave it default? i messed with it a little, and notices that certain settings will prevent windows index experience to run, so i set it back to default cause im wondering if it will effect other programs negativly.

and 2ndly, ive installed a few games and all work fine so far but one. dirt 2. itjust gives me a black screen but like the loading and auto save windows are visable when the appear, and you can hear the audio, even the sounds it would make when you push a button. works fine with my gtx 260, but not my 470. battle feild bad company 2, need for speed shift, ect ect all play fine. any thoughts?

 

[kdfresh09]

alright, so i have decided that i am going to make this my card of choice, unless someone can recomend something different for around the same price as these:

http://www.newegg.com/Product/Product.aspx?Item=N82E16814130550
which is $260 or

http://www.newegg.com/Product/Product.aspx?Item=N82E16814187110
which is $250

can my power supply handle this card with my set up in my sig? and what about the 480? i was kind of thinking about that, though i dont know if the price is worth it, or if my power suply can handle it.

or should i just wait, and take a chance of prices not coming down this low for the 470's and get a 475 when it comes out (who knows when)? somebody please give me some guidance on what to do and what my power supply can handle, as if i am to get one of these cards id like to do it before the weekend is over as the prices will go up then. i think the sale ends then. anyways thanks for tollerating my rambling, and for the help.