i3 530 & 4GB will be acceptable for a few years (depending on your games) but the ATI 5750 wouldn't be acceptable. I would recommend at minmum a 5770 but would highly recommend a 58xx for better performance to last 2yrs.
We've got details in front of us of Intel's next generation platforms due in 2011, along with its 'Sandy Bridge' CPUs.
Yes, that's right, LGA1155 - one fewer pins than current LGA1156 CPUs. These sockets are NOT compatible, so you cannot use an existing LGA1156 CPU in a new motherboard or visa versa. Not only is the position of pin-1 different, the socket notch has moved from 9mm to 11.5mm from the centre and the entire voltage plane layout has changed.