Hi I am building a pc and I want a the best graphics card I can get for under 150 also I am kinda having a problem understanding which is better do I want higher bit or memory I mean which is better 1 gig mem and 128 bit or 512MB and 256 bit. any help would be greatly appreciated
150 what, US dollars? Don't read into specifications like memory bus width, as you can't judge performance from reading the numbers. It's simply a matter of knowing how fast each card is. Assuming you mean US Dollars, the best card for that money is probably http://www.newegg.com/Product/Product.aspx?Item=N82E16814150462 The GTX460 is a fair bit more powerful, but cards from reliable partners are more expensive than $150 anyway.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161309 or http://www.newegg.com/Product/Product.aspx?Item=N82E16814187120