I have a 66" Tembo. 51 @ 28 and I draw 27.5. I do prefer the 66 over a 68. Nothing wrong with a 68, just prefer the 66. I owned a 70" & I'm only 5'6" & that 70" was a bear to string. That's a consideration some people don't take into account. Still, I don't think you'll be disappointing whatever length you choose. Lot's of folks opt for the longer bows but, the 66 is very smooth.
I've owned all the grip styles & prefer Craig's locator grip or straight grip. It's a very small locator but, it does what it's supposed to. If I were to order a new Hill, it would be the Tembo. As far as I can tell, its very comparable to my Cheetah in cast but it's 5 lbs. lighter draw.