Your ideal body weight is something you set for yourself, within a reasonable limit. As long as you're not anorexic with a goal weight of Holocaust or one of those fat acceptance people who proudly proclaim that obesity is beautiful, it's fairly reasonable to assume you will set a limit at which you will be happy and healthy. It's different for everyone; at the recommended weight for my height, I was almost at the highest weight I had ever been and felt horrible.
F 28/5'4/100 lbs
"I'm not a psychopath, I'm a high-functioning sociopath; do your research."