I went through this same decision a year ago with 5100s, 6112s, or Fox 2.0. I settled on the Fox 2.0 for a few reasons.
1: Seeing as you are in the Northeast the aluminum bodies and rubber bushings will help with corrosion from the road salt. This was the game changer for me.
2: Fox is rebuildable
3: You can get them in snap ring shocks and use your OE springs or opt for the prebuilt ones with nice 600lb springs. I felt paying for them to be built was kinda silly and brought the 5100/Fox snap ring cost closer to the already built Fox.
4:Fox 2.0s are a great shock with a very positive reputation across a lot of vehicles.
5: I wanted the level look and Fox was set at 2" already ready to bolt in.
6: Linear (Fox) vs. digressive (bilstein) valving. Linear valving is better all around. I offroad some and nothing to warrant anything more than these, but I wanted to still get my monies worth when I do go offroad.
Bilstein does make a great shock and I think bang for the buck the 5100s can't be beat, however. Under $500 for front and rear is enticing. But, the Fox is a better shock for not much more, IMO.