Keep the Conshelf 21, the Calypso octo, the pressure gauge and the tank.
The Conshelf is still an excellent reg and uses the same internal parts as the AquaLung Titan. The Calypso octo is till a good second and if the pressure gauge works, use it. If the Voit tank passes hydro and vis, dive it.
I have several Conshelf regulators of different models and I love them. They are bulletproof, dependable and easily serviced. I'm a big fan of the Conshelfs.
$130 dollars for service sounds high to me. I usually service my own regs but on the rare occasions that I've had my LDS do it, it's been around $40. Even at $130, that's about a third to a quarter what you would spend on a new, comparable setup.
Steel tanks last a very long time. We have eleven steel 72 tanks from the '60s and '70s and dive them all. I'm using two of them as a set of doubles connected by an old-style J-valve manifold that has one, center tap between the tanks.
No sense in throwing out gear that is perfectly serviceable.
TommyDSports sells good wetsuits for less than a hundred bucks. I have a couple of them and they are surprisingly good for the price.
Tusa Liberator X-10 fins can be bought new for less than $30.
Check out the VUE mask from The Snorkel Mart. Inexpensive, very comfortable, fits well and better than average visibilty.