I've seen that chart before, and realistically, most of that stuff is just for shooting range dick measuring. Its all nice to have, but you really don't need all those amazing features unless you are air assaulting into the mountains of Afghanistan. Figure out what you NEED, then buy the cheapest (price wise) gun with those features. Use the money you save to buy ammo and practice practice practice.
So THAT is why my rifle came with this ruler. . . .
You can get a lower half for reasonable from places for at or below $300 bucks. Then you can buy a lower off of Midway or other for around $450+
I know there are people who could do a lot better, but I'm just a lowly medical student.