Chapter: 450 (DBZ 256), P2.5, P3.1-4
Context: after Kaioshin again warns against unleashing Boo
Vegeta: “Hmph…The way things are going, this ‘Majin Boo’ guy isn’t going to be anything special, is he? Just like that ‘Dabra’ jerk…[ ] I’m saying that this ‘Dabra’ guy doesn’t seem as bad as you two feared. Looking at his attacks and movement outside earlier, it seems that if we just watch out for his spit, then we should manage something. I can’t call Kibito anything but a bumbler for getting done-in like that…”
Kaioshin: “…Is-is that true, Son Goku?...”
Goku: “Yeah…Well, even if that wasn’t him at full force…I think that before he would have been a frightening opponent, but…7 years ago there was a guy called ‘Cell’…[Dabra]’s probably about as strong as him…”
It's an interesting passage that can be taken multiple ways. I could assume Vegeta means managing something with all of them attacking as a unit since he says "we." And then Goku says Dabura is as strong as Cell, which would have been an issue before not anymore...and we know from later on that Goku isn't very far above Gohan from the Cell Games.