08 Taco rear suspension ?s please help

I have a 08 dc trd taco with about 145,000 miles raised 2.75" in the front w/ a 1" spacer and shot rear suspension in the back. My truck sags quite a bit in the rear and i have a flat if not negative curve in my leaf springs. I have been reading the forums for weeks now and found lots of helpful threads on how to potentially resolve my sagging problem but none that specifically answer my questions. Bare with me.

The spacer was intended to level the truck but since the rear suspension is shot my truck now sits higher by 1" in the front and leans slightly to the right in the back due to shitty leafs. Due to the sagging rear end I am having a difficult time figuring out the actual height I need from the new suspension.

What I have concluded is that I want/need new leafs and shocks in the rear but I am having problems deciding what products will get me the desired height. The items I have been looking at are bilstein 5100s 0r 5150s with dakars or wheelers leaf packs.

I am pleased with the height I got out of the front and now just want the rear to be level or slightly (0-1") higher but not too high. I am unable to figure out if 5100s will work for the height I that i need to level the truck and also if dakars will raise the rear too much. If this is the case I was going to go with the wheelers pack that raised the back only 1.5" and still keep the 5100s in the back. Please help me!

 

What shocks are you using?