I have the answer, Insomniac!

I think they should give ratchet a few years off. I love the ratchet games but I want Jak back and since Naughty dog is too busy making AAA games they don't have time to make another Jak game. Insomniac is the only other company I would trust to deliver a awesome Jak game. 

Who would you suggest?

Make a third ND team

That would be another option, If Jak launched with Naughty dog logo on the front cover it would sell alot more than if it was any other company.

You have no idea how much I want another game, I had to settle with platinuming all 3 games on both PS3 and vita.

My top pick would be Insomniac too, I just can't think of any other developer that could make it without making it horrible.

I would trust Sanzaru. Sly 4 was great.

Insomniac is the obvious first choice. I'd say the developers for modnation racers would also work. And Sanzaru of course - sly 4 was pretty good.

I agree, I just don't think they would have the passion to make a Jak game like they do for Sly.

Jak X Ratchet. Why hasn't this happened yet?

The guys who made sly 4.
Insomniac could do it too, but I doubt they will