Lots of good information on this thread. I wanted to hit a few quick points, at least one of which I've seen mentioned but I want to make sure it hit's home.
You do not need to lift to clear 37s, assuming that you're using the correct offset wheels. Even if you do lift, you have to get pretty high (6" or more of lift) to account for poorly chosen wheel offset. So your buddy, or whoever, that is saying "you need a lift to clear 37s" is just flat out wrong. This isn't a personal opinion thing, it's just a fact.
Ok, that said, it seems pretty obvious that this is really all a "looks thing" for the wife. So, you have to decide what you want based off 3 categories, where you can only pick two. Price, Lift height, ride comfort.
Price and ride comfort: I'd go with Thuren or Carli here. You can start to do things piecemeal and add later if you so choose. For example, with Thuren I'd recommend front coils, sway bar, track bar, shocks. If you decide later you want to, you can add rear leafs for an even softer ride. Carli has a 3.25" suspension, which is similar but the price is about 3.5k, so a hair more. Similarly you can add the rear leaf later, so you can choose to upgrade down the line.
Price and lift height: Most of these setups are pretty damn similar. I'd probably recommend something like the BDS kit, which offers a 6" lift radius arm kit for just under 2.5k. Keep in mind, that most of these kits are "lift kits" not suspension systems. Which means that they will ride, at best, similar to stock and not better. Anyone trying to tell you that a lift that jacks the truck up 6-10" and is using a bunch of brackets and progressive rate coils is lying to you. It's just not how things work. That said, for some folks, it's not a huge deal. If the Mrs wants the look, then the larger tires on smaller wheels should help a lot with on road comfort. It won't ever be as nice as other options, but these modern trucks do ride pretty nice compared to trucks from the 90s, so there is that.
Ride comfort and lift height: Whip out the check book, because this isn't cheap. Kelderman air suspension is gonna run you close to 8k in parts alone to get you a 6"+ lift, but because it's airbag, it's gonna ride super nice. Their kits are also incredibly well thought out. Again though, you're talking about a kit that is insanely expensive, and for some folks changing over to bags is a no-go, regardless of what you tell them on bag durability.
One other thing to call out. 37s aren't gonna fit in the factory spare location, the frame rails are too narrow. So you're gonna need to run a smaller spare (35" will fit), run a spare mounted in the bed, or no spare at all.
