Intel core i5 450m vs 430m for gaming

I am looking for a gaming laptop thats between $1000-1100. I am confused between whether to buy the 450m or the 430m. I want to be able to play games like COD, assassins creed2,battlefield bad company2, justcause2, crysis2,batman arkham asylum and all other most common fps shooter games on preferbly medium to high settings. All i dont know is which proccesor to buy 450m or 430m. 430m is older than 450m by 3 months. Most laptops nowadays I see are coming with 430m so I get scared thinking that 450m is not good but on the other hand i also think that 450m is newer so it might take somew time for more laptops to come out.I know the main difference is their clock speeds but i think clock speeds matter in gaming.
Anyways I live in North America,Canada.