Of those three, I think a prime version of Rampage would fare best today. He was hella' durable, great boxing, KO power, and a wrestling game he could turn on when he needed it. Also, even though he's mocked jiu jitsu in the past, he had a very good anti-grappling game. In over 50 fights, he's only been submitted twice. That's impressive, especially given the level of competition he faced throughout his career.
I think Tito would also do well. He's easy to make fun of these days, but at his best he was a very strong wrestle-grappler with great conditioning and could finish people with g&p, and occasionally with a sub. People forget that even though he was losing a lot of fights towards the end of his UFC run, he was still competitive in most of them.
Lastly, I don't think Chuck would do nearly as well today. I recently watched almost all of Chuck's UFC and Pride fights, and he got by largely on his KO power and durability. He wasn't fast, he got hit a lot, and even though his conditioning wasn't bad, he also never pushed a very high pace. Of course, his famous defensive wrestling enabled him to carve out a great career beating offensive wrestler types who weren't very good strikers. I could picture a prime Chuck beating a few of today's 205ers, but I don't think he would crack a modern top 10 of the division.