Chipset question

[BUTCH1]

Hello all, I was looking to replace my Asrock dual-vista board with an intel based 775 board. I noticed a large selection based on the "G" series w/integrated video for low prices, I wont be using onboard video but I was wondering if there is a large performance hit using one of these chipsets vs the p35/45 series. I do a mild OC to my e4600 to 3Ghz and am planning to add a 9800GT as a video card. Thanks in advance for any advise/suggestions..