Fully agree with the drysuit as the first step, and sounds like you are already starting that process.
So, good start, you have your backgas regs already.I have: 2 xtx 100's and that is about it.
Absolutely nothing wrong with that as a starting point. Get a SS BP, and a small wing, and start diving singles. Add a doubles wing a little later.-backplate and wing, was going to go w/ H eclipse 40# and evolve 60#, but am not so sure about that now after reading a bunch of posts.
At your age, and assuming a level of fitness, think about HP steel 130s. They are good single tanks, and a good doubles rig when you add a manifold. But, if you can find already doubled HP100s (or 120s) at a good price, that would be an additional option.-twins, I would just assume go as big as I can for now. I can always get smaller ones later, but don't want to be limited by size now! Does that make sense, what should I be looking for?
Start with a 40 cf AL. You may add 80s or 30s later, but having a 40 is a reasonable first step. If nothing else, it is a good pony bottle and allows you to develop skill slinging it on single tank wreck dives.-deco bottle size?
If you get a GOOD drysuit, a SS BP (irrespective of brand), a good singles wing and doubles wing (again, irrespective of brand), and HP steel tanks (100, 120, 130, whatever), chances are you won't 'wish you had gotten something else'. You WILL add gear over time, and you may tweak your gear - sell something and buy something else - but you probably won't regret the initial purchase.I don't mind spending the money, I just don't want to spend it and then wish I had gotten something else, and have way too much info running through my head right now.