I'm changing my answer:

https://en.wikiquote.org/wiki/Soulcalibur_II

The best one is Super Street Fighter 4 one, bar none.

Its Ultra David and James Chen!
If we are talking actual in game announcers its Soul Calibur

Xander Mobus in Smash Wii U.

Tekken announcer

"This is going to be a match to remember!"
"Live and Let Die"
"This battle is about to explode"
"If you choose the wrong groove, you just might l-r-o-o-o-o-..."
"Check your training wheels at the door"
"You can feel the intensity in the air"
"Some may say that it was luck that helped this team advance"
"Hey, who allowed them to join this tournament? They're way too strong to compete. I mean, what's up with that?"

Capcom Vs SNK 2 announcer. Simply the best... ; )

"I know that yoou'll beee baaaaaaaaaack.."

"Thats what we like to call BIG DAMAGE!"

I knew I was missing someone...

I like the Smash announcer but I also like the one from the older Halo multiplayer segments.

That and the MK announcer from the older MK games. in the end though for my personally nothing beats Starcraft II's announcers like the Protoss.

I like the pre-4 Smash announcer.

the original smash announcer