I bought the TLS350 brand new, but as new old stock so I got it for $1400. I wouldn't pay full price for it. It's not a bad suit, it's incredibly comfortable, the lightest suit on the market and dries in minutes. That's really handy on week long diving vacations when you get some leakage, unlike a neoprene suit which will stay wet all week. The exhaust valve sucks...it doesn't vent too easy and it sucks in water if you leave it any more than 5 clicks(or so) closed, at which point it doesn't vent unless you put some serious air against it. It's easy to replace, however(Si-Tech's are popular exhaust valves). I've found it to be more durable and rugged a suit than expected. Don't let the lightweight flexible construction fool you, this suit IS bombproof, no joke. For your consideration, my profile is mostly wreck diving on unintentional shipwrecks(i.e. NOT diver friendly) and also just got into cave diving. If you're not so sold on the ruggedness, just add some kneepads.
The Pinnacle is also bombproof. After seeing my buddies I'm pretty impressed. It costs a hell of a lot less but lacks the not-so-like-a-drysuit comfort factor. If I were to replace my TLS350 and couldn't find a nice deal on a new one, I'd get a Pinnacle Evo II front entry, hands down, over all other suits out there, unless I'm consistently doing sub 40* temperatures, at which point I'd probably get a Bare XCD2 for that little extra bit of insulation offered by neoprene. CF200 is WAY overpriced IMHO, but that's a different discussion.
Either are great suits. Think about how much money you want to spend, and if you want 100% functionality or 90% functionality(that can be made 100%) with some creature comforts. Try and test dive both. Also, check DUI's factory closeout list and see if you can get a deal.