For long term reliability and durability, definitely go with a helical head. The carbide cutters are 4 sided and have exceptional longevity as long as you are mindful of your material. They are also self-indexing which eliminates time consuming setups.
I'd look for a used Jet or Powermatic. I have a very low opinion of grizzly and would not recommend anything made by them. The DeWalt 735 is also a very good machine and will serve you well. We have one for our back-up planer.
Dust collection is an absolute must, planers are one of the "dirtiest" machines in the shop. A shop vac will not keep up with a planer. I'd recommend at least a 1 1/2hp dust collector and a separator if you are planning to plane large amounts of material.
Planing glue joints is not a big problem, but I always scrape excess glue off before planing. We spend a little time inspecting material before putting it through the planer. We do a quick pass with a metal detector, wire brush it lightly if there is dirt or grit on it, and scrape excess glue from glue joints. That helps minimize knicks in the knives.
The tools don't make the craftsman......a true statement often overused by individuals who haven't a clue about quality tools or true craftsmanship.