If we ignore the fact that you are wrong about macs having IPS screens, assume that a USB 3 is a reasonable substitute for a firewire 800 port and that 500g more is within the same weight target, then finding a cheaper laptop that compares favourably, spec wise, to the MacBook Pro is no problem at all. Took me about 30 seconds. You even get 1920x1080 resolution.
Now I'm no anti-mac zealot and will happily accept that the MBP almost certainly has better battery life, certain is much better looking and better designed and may even have better build quality. I'll even admit that if I where looking for a new high end 15-17" laptop I'd probably pay the necessary premium to get an MBP. But the bottom line is that on a simple spec sheet comparison Apple will almost always lose out on price.
Now I'm no anti-mac zealot and will happily accept that the MBP almost certainly has better battery life, certain is much better looking and better designed and may even have better build quality. I'll even admit that if I where looking for a new high end 15-17" laptop I'd probably pay the necessary premium to get an MBP. But the bottom line is that on a simple spec sheet comparison Apple will almost always lose out on price.