GP, seems like for an outfit your size, and having some various skill sets and lots of people in-house to sell work and get it done, with capability to grow, a lift seems like it would be very useful. What is the tree height in your area? Spider lifts seem to be where its going. I could get a spider-lift into today's job, but not a bucket-truck. Same with tomorrow's job.
What I use sometimes is a 50' tow-behind lift, moved into place with my mini. I've gotten to dead trees where I could get the mini and lift, just just just barely for some dead trees that left me puzzled otherwise. Wouldn't have been able to access the area with my truck and lift.
My friend used to have a 61' Bil-jax tow-behind lift, available as a rental. His market was flat, open lawns. 60-70' trees mostly. Fit for him.
fwiw.