Go with the 4px. I was in the same dilemma as you. I was looking at the lynx 4s and spektrum dx4r that that seamed kinda cheaply made.
I just bought a new 4px from tower hobbies for 450 with coupon a couple weeks ago, it came with one receiver though. I liked the 4px easy to use menus plus you can get extra receivers cheaper down the road. I bought a couple of aftermarket orangerx fasst receivers and s-fhss receivers from hobbyking.com. for future rc builds. They binded like almost right away. Its still cheaper even if you buy one fasst receiver ( gr400f) for 32-34 $ or 2 s-fhss(gr400s) for 16 dollars each plus a couple bucks for shipping. they are out of stock of the fasst gr400f's because i bought a couple of those lol.
back to the op, I am really impressed with the quality of the display of the futaba 4px.