It all boils down to the 80/20 rule. What are you doing with your truck 80% of the time? If its a road rig then stay with what you got and do some mods. If your like me, and it sounds like you kinda are since your already leaning toward SAS, I like the SAS swap idea. There are lots of manufacturers that offer a quality 4-link kit with coil over. I think that is the way I'm gonna go when I decide to really "use" my truck.
I know the shit is gonna hit the fan now with you IFS guys. Been here, done that. We can go round and round on this but opinions are like assholes. And that's just mine. But like I said 80/20 rule. I like the IFS ride too.
Here's a couple shots of a guys truck I was talking with the other day. He just bought it and says it rides great and he's putting 38"s on it. He's gonna get me more pics of the 4-link setup as I told him I was interested in doing the same.
Here's what he said about this truck:
I picked up an 06 LBZ Duramax with an Allison. It also has a 4 linked AAM 9.25 front under 4.5" coils. The transfer case was swapped out for a NV 273. The rear still has the 11.5 with a shackle flip with blocks, which will eventually be swapped out with 3-4" springs. It also has firestone airbags out back with fox rezzy's.
It has an AFE intake with the EGR blocked and a shimmed fuel rail. Also has a PPE tuner and Air Dog 2 165. The Allison has a Transgo Jr shift kit.
The exhaust is a 4" straight pipe that dumps under the bed and it also has a 60 gal fuel cell/tool box that can drain into the main tank.
Right now I'm getting about 16.5 in the city and have seen up to 21.5 on the highway. It needs bigger tires bad, which will most likely be a 38x15.50. I'm thinking MTZ, but we'll see what happens.
It needs some small cosmetic things, but overall I'm happier than a pig in mud.