I'm 6'1" and have porked up to over 260.
I have a Waterproof W7 5mm that is my everyday suit these days. It is a Large Plus. It has to stretch a fair bit to get around my torso, but it does it and is comfortable. I've been diving it for about a year and a half and have 138 dives on it. The only thing that has "broken" are the little straps near the wrists that you're meant to put your dive computer wrist strap through. Both of mine have recently broken off. Otherwise, the suit is still more or less like new. The Kevlar knee pads have been particularly impressive, as I have definitely been on my knees on some rocks crawling out of some dives, and they don't show any signs of that. I have dived it in water as cold as 59F. I was cold at 59F. At 62F, for a short shallow dive, with a hood, I was adequately warm. At 62F for a 51 minute dive at 127', with a hood and 3mm gloves, I was cold by the end, but not freezing. In other words, I think it's a good, decently warm suit. Also, I'm towards the polar bear end of the spectrum for cold tolerance.
I have a Bare Reactive 3mm and had a 5mm. Both size XL. I sold the Reactive 5mm when I got the W7. I think the Reactive suits are a little bit warmer, but the Waterproof has thigh pockets, which are awesome. For ME, having the sweet thigh pockets trumps having the suit be a little warmer. If it's too cold for the W7, I'll wear a drysuit.
My Bare suits are 3 or 4 years old. The latest version is claimed to be 30% warmer than the version I have. I don't know about that, but I do expect it would be a clear winner in warmth over the W7. The W7 is warm - just not as warm as the Reactive, in my somewhat subjective opinion.
A point about Waterproof wetsuits. The W7 is a totally different neoprene than their older suits, like the W4. The older neoprene is much more stiff and less stretchy. I think that is one reason why they have (or had?) so many different sizes in their size chart. The good thing about those older suits, though, is if it fit you right, then it was even better than the new suits because the neoprene did not compress as much as depth, so they stayed warmer when you're down deep. The newer neoprene is more stretchy and maybe more comfortable. Certainly more comfortable if you're on the cusp between two sizes. But, I think the new suits are not AS warm at, say, 100' or deeper, because they compress more. Maybe they make up for it by sealing better at the openings. I don't know. I never dived one of the old suits. All I'm REALLY trying to say here is, don't judge the W7 based on any of the older WP suits that were made of the older neoprene.
Last point of note, for the really cold-intolerant: Waterproof has just come out with a semi-dry version of the W7, they are calling the SD (or SD Neoflex).
waterproof.eu
They are not available in the U.S. yet. My GUESS is they will start showing up here in the Nov-Dec timeframe, but I really don't know. That guess is based on when the W7 showed up on the Euro website and then how long it took to be available here.
I only know what I've seen on their website, but it looks like the SD is simply the W7 7mm, but with the back zipper changed to a cross-the-back plastic drysuit zipper, and with the neoprene neck seal built-in, instead of an add-on option. The W7 already has drysuit seals at the wrists and ankles - and they work.