Most likely the 6150SE. But why buy one of these cards? What type of port/bus will these be plugged into? PCI? PCI-e? AGP? And what is your budget?
The 6150SE. I'm guessing you're buying a new PC with the 6150SE in it and want to know if your old 7000 is better. It isn't, and it might also not be compatible since it'll probably be AGP, and new PCs typically use PCI express. If you want to play recent games however, neither are anywhere near adequate.