Just as an FYI - there are lightsaber forums at TCSS (the custom saber shop) and FX-sabers, as well as at the Imperial Royal Arms, that you might find also helpful.
As for Ultrasabers, there are many differing opinions. I started out with an Ultrasabers Dominix, which I subsequently gave away when I started to build my own sabers. Their internal build quality is functional, but mediocre at best, and their prices are fairly low (you of course get what you pay for). I have found their customer service to be...situation dependent. If you have praise for them and their products, then it's great. If you have any issues with your purchases or criticism, then I have found them to be.... poor (and that's putting it nicely).
Parks Sabers are much better overall quality, IMHO. But there is a cost differential. And yes, there have been controversies in the past with both vendors.
However, I would encourage you to also look into the possibility of constructing and building your own saber. You do need to have a little bit of basic electronics / physics knowledge and soldering ability, but once you get into it, it can be a pretty rewarding experience.