I bought my first dry suit knowing absolutely nothing at all, except that dry suits were frighteningly expensive. It was a Mobby's laminate suit that had been hanging in the shop for a couple of years because it was too small for everybody else. I paid $800 for it, I think, which seemed painful, but the suit fit and although it had an annoying and elusive leak in the crotch seam which resulted in intermittent damp dives for a couple of years, despite trips to the repair place (on warranty), overall, I can't complain about the suit at all.
My second suit was a Diving Concepts suit. I would say much about that deal except that I will never own anything made by that company. For what I lost in that process, I could have bought another suit (one that fit and worked) from another company.
For the last five years, I've been diving Fusions. I own two of them now. They get around one of the biggest issues with other dry suits, which is proper fit, and they also get around one of the biggest annoyances in dry suits, which is the waiting period when you are getting seals replaced, if you don't do your own dry suit work.
I think you can do very well with inexpensive dry suits, if you accept that they may not be as durable, and you may not get the same degree of fit. Better an inexpensive dry suit that you will replace in a few years, but that gets you into the water diving regularly, than a wetsuit that is uncomfortable enough that you don't dive very often.