i get a solid 200 ms ping (*rolls eyes*) when there arent any issues on my 4MB PTCL. Thought about upgrading but i dont think it will do much better.
I guess hitscans are a better pick but you will still find yourself sniped behind a wall even if you poke out for a second.
If you are looking to buy i would suggest you buy from PSN because the patches are so huge, you are downloading the full game anyway