Here are my thoughts on your question:
There are some fly fishermen who wet wade during the season when I am cold using waders! What is considered "cold" to one person may not be cold to the next person. I have Graves Disease which makes me sensitive to cold and I will be cold while wading when others are comfortable wet wading. So, I recommend that you weigh this out carefully and base your answer on your needs and not what works for others.
For me, I use chest high breathable Orvis waders during the hot summer months and switch to waist high neoprene waders for my winter time fishing. I do not wade in real deep water during the cold months. You can pick up a pair of waist high neoprene waders for less than $70 and this will allow you more money for the breathable waders.
I know this probably does not help you, but, I just wanted to make sure that you know that what is cold for one may be warm for you and vise versa.
Just my thoughts and nothing more....
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.