Heath74,
Welcome to the boards, from NJ!
Regarding the wetsuit question: I have a 3mm henderson "gold core", and I am very pleased with it. The Gold "lining" (?) makes it easier to get on, creates a better seal than the nylon linings, and dries quickly. While my suit is less thick than what you are looking at, I believe the three items I mentioned would still apply.
Since I bought my suit, I have seen other suits advertised with similar linings, for less money. Aquaflight(?) comes to mind.
Regarding the Harveys suit, I have heard that Harveys makes good suits, but have no personal experience with them. As far as the "titanium" goes, if it is contained within the neoprene,and is "sold" as increasing warmth, I have read that that claim is bull....
However, if it refers to a Lining that functions as the "gold core" does, than maybe you should "go with your wallet" in mind.
Of course,above and beyond linings, advice, etc. is :Which fits better??
I would imagine you'll be hearing a variety of replies to this post.
Finally, for more info, I'd suggest doing a "search" of the board's older posts-there are several dealing with wetsuits,to say the least.
Good luck, and let us know what you decide.
MikeD