If your original 4 were in their prime conditions, I'd have to go with Segal. The best offence is a good defense. He has the best defense out of any of them.
Goldberg probably wouldn't stand a chance against any of them. If...and that's a big IF, he could get in and grapple, then he'd pound them to a pulp. But, he'd never get that close. One nice shot to the knee or throat and he's down for the count.
I think that a Bruce Lee vs. Jet Li fight would be pretty cool. Haven't seen enough of Jet Li in action to call it. I personally think that Bruce would probably win because he has the experience to overcome Li's speed.