Wedding Lens Kit for Rental

I run a small business renting lenses and cameras in the Pittsburgh, PA (USA) area. I've gotten a lot of business from wedding photographers so I am looking to upgrade my offerings. Here's what I've got so far:

Canon 5D Mark II
Canon 7D
Canon 1D Mark II

Tamron 17-35 f/2.8-4
Tamron 17-50 f/2.8 (Di-II)
Tamron 24-70 f/2.8 VC USD
Sigma 70-200 f/2.8 OS HSM
Sigma 120-300 f/2.8 HSM

Canon 35 f/2.0
Canon 50 f/1.5
Canon 85 f/1.8
Canon 135 f/2.0

Speedlite 420 and 550

I mainly find that wedding photographers rent the 5D Mark II, 24-70, 70-200, a flash, and sometimes the 50mm.

I am considering adding the following:
Canon 5D Mark III
Canon 70-200 f/2.8 IS USM II
Canon 35 f/1.4L
Canon 24 f/1.4L

What other suggestions do people have of what I could add to strengthen my offerings for wedding photographers?