A couple of weeks ago, right after I left for vacation, both Marco Rubio and Scott Walker finally released "replacement plans" for the ACA. Rubio's was really just an op-ed sort of thing, but Walker's has received quite a bit of attention because it reminds people that he's still running for President and it actually bears some resemblance to an actual policy paper, which is more than anything else the GOP has come up with over the past 6 years.
I was planning on writing up my own analysis of each when I got back, but frankly, I'm too backlogged with other stuff (both ACA and day-job related...I need another vacation from my vacation now...). Plus, many, many others more knowledgable about these things than I have done fantastic writeups already: