Great chart, but I didn't mention speed. Why did you show us? I simply said 10k isn't respectable, and then went on to hint about the 6500 ft reach of ack. Great chart though.
Respectable suggested "safe" or "worthy"
Usually when choosing an alt you look for the peak speed on the speed chart. You look at a Betty for example it tops out 9K then drops off really bad and goes back up. So unless you fly at FTH your second best bet is 9K
So along those lines I included the speed chart to show that most of those alts are pretty respectable. Speed will save you in that plane. Speed, and staying out of the ack
(as you mention)