which aftermarket A/C to use?

[robsm88]

any suggestions on who to use for aftermarket A/C controls. I like the one from http://classictrucks.com/tech/0408cl_air/ from classicautoair. I want to keep my firewall clean, and I allready have condenssor and a compressor from an 05. I just need the control box with evaporator and heater core. classicauto wants $575 for there evap kit. Here is there pricing.
21. 1967-72 Chevy / GMC truck:
Complete System: $1,095.00 Part # (134a) 20-210 (R-12) 20-203
Evaporator kit: $ 575.00 Part # 1-1033
Condenser kit: $ 239.90 Part # 11-2022
Uses original heater control panel.
Options: Adapter kit to install system in factory A/C truck. $59.00 Part# 1-1503
Dash vent choices (3).
1. Under dash (no up charge).
2.In dash. Classic Air ball vents (no up charge).
3. Reproduction factory A/C ball vents. Ball housing available black (paint to match dash) or chrome. Balls chrome only. Choice 3 add $99.00.
Reproduction of original chrome center vent is standard equipment on both in dash choices!