4 Link or springs

Working on my build plan and could use some input.

I'm going to be mini tubbing the dart and while i'm at it was looking at redoing the suspension in the rear.

Ballpark numbers.
Triangulate 4 link and coil overs for ~ $1000
Leaf relocation parts, new springs, sway bar for ~ $850

Waiting to hear back from Ridetech, asked them a couple questions about their triangulated air4link.

I want to bring the ride height down about 2-3 inches.

What am i missing expense wise?
Will the triangulated 4 link get me anything that a new leaf spring setup wouldn't?

I am just envisioning myself a year down the road looking at the car going, man for the same price I could just as well put the 4 link in it.

Sorry for the shotgun pattern of questions. Wife is breathing down my neck to leave for a Christmas party.