If you're in there, you might as well replace everything. I would NOT recommend taking it to the Chevy dealership to have it replaced. I'd find an independent shop to do the work. It will be cheaper and likely done with higher quality work. Hyundais are pretty straight forward, any independent shop should be able to do the work.
As an aside, I don't know if this is a Sport model or the three row, so I'm not sure if it's the 4 cylinder or 6 cylinder, but issues with the timing chains or tensioners is not common. While I don't know the mileage either, I think there may have been a few missed oil changes in this car's past. It sucks that it needs this much work so soon after purchase, but I'd do a couple of short OCIs after repair just to try to clean stuff out as much as possible.