Awesome! Yes, it helps a lot and thank you for taking the time to write/share. Much appreciated. I'll definitely be going back to read closer later.
Cost/savings is a consideration, but I def don't mind spending more. Right now, I'm thinking it's a waste to get an top notch stock and still shoot a stock barrel. That and I'll be shooting factory match ammo, at least for a while more. Would a better stock help? Probably, but one of those thing where I think the difference is wasted on me. I did look more into the KRG that you mentioned and mentioned above as well. I really am interested in the MPA and Manners though. Still, if I could find an A5 in stock or lead time was less, I'd probably go with that.
I was looking into Manners more, including their rifle stocks, as well.
Then now I have to be on the lookout for ammo. I have a decent amount, but would very much like to have more, especially when I start shooting more. Will just have to bite the bullet and pay a bit of premium. Sucks that I was starting to get into this almost 10 years ago and then took a break, which mostly coincided with all the steel being taken down at KHSC. 
The question of what to upgrade first is always vert subjective IMO. I think initially we all get caught up in getting the best glass or best barrel or best trigger or bipod. If i could go back to the start or if im teaching someone new ish to more of a "practical" shooting style (prone, kneeling, prs ish, real world hunting), i would say to upgrade your chassis or stock first.
The reason being that, as you shoot more and more varied options. You realize how compromised ur shooting technique can get when your interface to the rifle itself is compromised. For example, the manners t6a just didnt fit me well and i always had an uneasy tension when shooting prone vs my mcmillan a5. I always strugged to get consistent cheek weld, the grip was a little too thick for my small hands. But i bought it because its what is "most popular" in forums, etc.
Bottom line, unless your interface with the rifle allows consistenty and comfort, there is absolutely nothing a new barrel or optic or trigger will do for you. Once you compromise your positioning and comfort, its game over imo. And its not a buy once cry once, its a try everything thing lol. Or get a chassis that as enuff modularity to give you those options. Or hopefully someone at the range is kind enough to let you lay behind their rifle and practice a few dry fires.
The best kind of rifle to test a stock or chassis is usually a 22lr or 223 bolt gun. Gives you more time to gather info (unless your rich and pop off 100+ rds of standard cartridges a day lol).
And make sure you test it prone, kneeling and from tripod if applicable. Testing from a bench does not count imo, unless thats the purpose of the rifle.
Sorry last part of rant. If you wanna give a chassis or stock a fair shake. Please do it justice and have a bipod and decent rear bag (armageddon, precision underground, tab. Etc)
Too many people i see saying their stocks or chassis "dont work" well and are shooting with no rear support or how to properly build a foundation shooting prone.
Let us know what you get! The beauty and curse of this time is there are so many great options, but with too many options can cause frustration and bankruptcy lol