His team try against the Magpies last Thursday in the crushing 48-20 win was one of the best of the season and was confirmation, if any were needed, that centre is his preferred position after taking one for the team and shifting to the wing for the narrow loss to North Harbour.
Now the focus shifts to the Wellington Lions who come to Pukekohe on Friday night to contest the inaugural Jonah Lomu Memorial Trophy.
"Jonah was a humble, well respected guy who started off here in Counties. The boys are keen to put in a good performance because Jonah was one of our own. Growing up, Jonah was always the guy that every island kid looked up to. I first saw him play when I was about six or seven," Vaka says.
A likely midfield match-up with Shaun Treeby and Matt Proctor will keep Vaka and second five Cardiff Vaega on their toes.
"It'll be a really tough day at the office with two Super Rugby midfielders. They are both on form. I'll need to do a lot of things well, like catch and pass."
Steelers coach Darryl Suasua has worked with Vaka at club level with Bombay before this season and knows all about his huge potential.
"Sam is a real talented athlete. He can be dangerous. I thought he did some quite outstanding stuff against Bay of Plenty back at centre. He can be really physical," says Suasua.
Vaka is the latest in a long line of talented Steelers midfielders. In recent times, there were Siale Piutau, Bundee Aki and Rey Lee-Lo. Back in the heyday of the late 1970s, think Bruce Robertson and Graeme Taylor.