My current numbers are:
Piccolo (Kami): 100
Piccolo (Kami, weighted): 80
Imperfect Cell: 67.5
Number 18: 67.5 (she said she was serious against Vegeta, which would put her way below 17)
Trunks: 16.5 (if he'd improved even close to Piccolo's level he could've beaten the Future Androids on his own, I think)
The thing is, only weighted Piccolo was said to rival the androids. I know you don't have Cell rivalling 17, but I'd have to think he wouldn't rival either of them.