I used Rancho
I had the Bilsteins and they lasted 7 years but I too wanted to do them myself so I was looking for a loaded strut. I scoured the web and did some reading. I have a 2005 Titan SE. I went with the Ranchos...
Rancho RS999921 Quick Lift Loaded Strut
Rancho RS999937 Quick Lift Loaded Strut
There is a right and a left. The titan sits nice and level as did it with the Bilsteins but these also have a ride select option. I set mine at 5 and it rides better than it did when in was new. I got these on Amazon which is not my 1st choice for auto parts but I paid $315 for the pair shipped free. I juiced all the bolts up with PB blaster a few days before and it only took me 45 minutes a side and was relatively easy. I am extremely happy with these for the money.
I also replaced the rears with the Rancho RS5000 Hydro Shocks for $105 also from amazon...
Truck rides amazing now!