This thread is probably going to implode once the admins see all of the prices on here.
I'm not sure what to tell you, oshuwah. Like you said, you could get the 4270 and PS3 for the same price as a 4280. The 4270 is far from junk and from what I've seen in various stores after fiddling with settings, the 8th gen Pioneers aren't the earth-shattering improvement everyone here claims them to be (at least in the 720p models). Better? Yes. Orgasmic picture improvement? No.
It just depends how much stuff you want to get with your money.
And make sure the seller on Amazon is an authorized Pioneer dealer so you get the warranty.