Whats a good affordable fail-proof PS3 router? (Always have an OPEN NAT type)?

I need a new router cuz my NAT type on black ops became "MODERATE" and its hard to connect. I know how to port foward to get an OPEN NAT type but my router doesnt have the capabilities. It is a SAGEM F@ST 1704. So can anyone suggest a reliable, affortable, router that will let me get an open NAT type? Im not looking for an expensive $100+ one but just a home router