One thing I'll mention is that 30# to 50# is a BIG jump… I'm thinking it would be a really good idea to at least try shooting something around 40, then maybe 45#'s, first.
Too heavy a bow will be sure fire way to set you back in your shooting.
And as for the original question: a higher price custom bow will not necessarily shoot any better than a production bow. Then there's all the custom made bows sold used, for a major discount compared to new. As you'll hear over and over here, the best bow for YOU will be the one that feels best, and shoots best, for YOU.
Brief story: I'm currently shooting an entry level production bow, circa 1972. Bottom limb is twisted. American company, but I noticed it was made in China. Grip felt a little awkward, so I did some simple modifications to it. I shoot it better than than I did a beautiful, perfect fitting custom which I was forced to sell. Don't get quite the same pleasure from shooting it… but the arrow goes where it's supposed to, and the bow is very, very, quiet.
Find a bow that you like, and be sure you can come to full draw comfortably,