Suspension Help

I have a 2000 4r. fairly stock, and I've noticed that the back kind of sags a little bit. No spring recall unfortunately, but I was looking into getting the Bilstein 5100's and they come out to about $800. What else should I look into getting for my suspension?

I've heard getting upper control arms might make a difference? I'm not too inclined when it comes to suspension.

 

Rear springs are the Achilles heel of Toyota’s depending on what they’ve been carrying. The springs probably need to be replaced on a 2000 if the back suspension sags, it’s 20 years old! Fortunately, it’s a relatively inexpensive task. As for the shocks and front coil overs, they may need replacement too. That’s a bit more involved. BTW, welcome from Canada to the forum!