I don't own a scale, won't buy one.
I think your ideal weight is the weight you feel best at.
According to their scale my "ideal healthy weight is 118 pounds"...my "recommended" weight range is between 105 and 132 pounds.
I range 125 to 135, depending on how my life is going, when I'm stressed or sick I loose weight, if I'm content and happy I gain a few... I've been at "my ideal" of 118 and even been at 110...I might have looked great to a few people, but I felt like a piece of shit.
Both my parents where never overweight, were active, didn't smoke, didn't do drugs, and didn't drink to excess. Didn't help much...bad genetics still won.