Bruce has spent more than £5m on the Tottenham duo, recruiting Huddlestone on a permanent deal and Livermore on a season-long loan.
And he reckons their arrival could be key to survival in the top flight.
"To agree a fee with Tottenham and then to persuade the two boys to come here, to enjoy playing here, we're delighted with the business we've done," Bruce said.
"It just shows what the Premier League is all about. To get two England players to come here at this time is terrific for us.
"Every manager is never, ever satisfied and I'd be happy with one more in but if we didn't do anything else then we've done very, very well with what we have managed to bring in.
"It's given us a huge chance of staying in the division, especially these two; this has got everyone to sit up and take notice of what we're trying to do.
"That's how far we've come in 12 months and that's what the Premier League can do."
Huddlestone admitted he was won over by Bruce's vision for the club, as well as the chance of more regular first-team football.
"I was very pleased with what the manager had to say, the role he has in mind for me and the way he wants the team to function," Huddlestone said.
"He wants me to get on ball as much as possible and give me licence to get forward as well.
"I had some some good years at Tottenham but the last couple of years, whether through injury or not being selected by the new manager, have been frustrating.
"I played quite a few games last year but not as many as I maybe would have liked.
"I have the chance to play more regularly that I was was given the opportunity to last season and as a footballer, when you've missed large periods with injury you just want to play as regularly as possible."