Ruzi,
I was much in the same situation as you, but I also had the added benefit of being 6’4" tall and built like a linebacker!
I wanted a SUV of boats, able to carry 100+lbs of camping gear, good for long distances, and could handle rough(er) waters.
I looked at many many boats, and most of the ones listed here so far couldn’t fit my frame (read that my fat ass.). The only boats that I could fit in in a touring/sea kayak were the Boreal Baffin P3, the Jackson Journey and the Wilderness Tsunami.
I quickly ruled out the Boreal, since it’s composite and rocks, and rocky shores and I seem to have this ongoing love affair, it was also the tightest fit of the three that I could fit.
So that left me with the Jackson Journey at 14ft. and the Wilderness Tsunami’s at 12, 14, 16 and 17ft. Ultimately I opted for the Tsunami in 17ft, as it had the greatest cargo capacity at 400lbs. Now considering I weigh 250 in just shorts that only left me with 150lbs of gear. So when you consider paddle, bilge pump, hydration pack, and all the other boat accouterments it really didn’t leave me much over my 100lb camping load out.
Unfortunately this boat does come in heavy, at 68lb, it’s definitely heavier than you want. but it’s tough as nails. I took it on a 30 mile river tour, thought the entire river was class 0-1 tops! turns out that there is a 1 mile section that is class 2, after a few hard bounces (it’s fast and easy to paddle but turns in about a fortnight.) and no damage it’s safe to say that the added weight was worth it.
Of course the phase 3 seating is fantastic which was also one of my deciding factors.
I’ve done a few races in it, a 10 mile one, came in second in my class, and first in my age group, 9th over all (8 surf skis, and the 20 something in a boreal that beat me in.)
I did a 15 mile race too, came in first in that one out of about 50 boats in my class. the Chop on the delaware River was about 18" and my Tsunami surfed it like a champ. So much so that I came in 1st, Overall, In Boat class, and in my Age Group (old fart.) I I was running against quite a few composite high end boats. (honestly I didn’t think I had a chance, so much so my boat is named the LongShot.)
The Tsunami 125 (12ft boat) comes with a 300lb capacity and weighs in at 51lb. I haven’t paddled it but it has basically the same lines as my 17ft Tsunami, so it should also go. However as others here have stated a 14ft boat would be the better choice. And that Tsunami, will tip the scales at 53 lbs, but for 2 lbs more you basically get 25lbs more cargo capacity.
My son, who just turned 14, and has graduated out of his kiddie kayak, wants a Tsunami after sitting in mine and paddling. however he doesn’t want the 17 footer I have, and wants the 14 ft one. So come march, I’ll be ordering one for him.
Why, well a longer boat will handle rougher waters better, it’ll track better, and generally go faster, which translates to less paddling effort. after I explained this to my son he opted to go from 12 ft to 14.
So in short that would be my recommendation on boat length.
Also just so you know where I am coming from, I cut my teeth in the late 70’s doing whitewater in 3m boats, and poke boats. in the 2000’s I moved into touring/camping boats and my current stable of boats I have play ocean surfing boats, Fishing boats, a few Box store boats (let friends use them.) and my old perceptions Dancer from my white water days.