Outsprinting Peachey isn't too hard to do, without the ball he's a pretty slow runner.
Michael Vella is quick for a prop, since he used to play on the wing, Alex Chan has some pace, he actually beat Joven Clarke to the line in the sevens, but I suspect Clarke wasn't putting much effort in, because even if he did catch him, what was he going to do, jump on Chan's back?
Steve Price is a pretty quick prop too, remember his break at Origin? Rauhihi has decent pace, so does Paul Stringer. Locks, well, Daniel Wagon is pretty quick, but guys like Timmins and Terry Hill, who used to be centres, play lock now, so they'd have to be the quickest. Menzies is very fast for a lock, too, although he's lost a bit of speed over the years.
Jamie Lyon is actually a great speedster too, he's run down Minichiello, another speedster, a few times this year, but along with Gasnier you don't notice just how quick they are because they have more than their speed, so aren't listed with the speedsters of the game, because guys like Donald, Slater, Wesser, Clarke and Graham only have their speed.