Replying to this made me realize that I've gone through more ARs that I usually remember.
First was actually a pistol, and though "cheap" for the time and built on a budget, still ran nearly a grand.
Second and third were low grade and are gone.
4th was very expensive (for me), at about $2,800, even though I shopped for the best deals, bought blem parts, and built it myself.
5th was an upper to share time on lower #4. $1,600 upper.
6th was a test of an Anderson barrel, using a mix of new and used parts. Only cost me about $250 (including some of the used parts), but the cheap barrel shoots and everything else is even higher quality.
7th was a slight variation of an almost exact clone of the 5th upper, but integrating lessons learned on the 5th.
8th was an exercise in seeing if I could build an AR from left-over and take-off parts, and a barrel with an extra hole drilled through it; and borrowing the BCG from my the Anderson-barreled upper. I have a total of $87 into the whole thing.
I did order a cheap BCG last week for $55. That'll put it at $142 for a rifle that could run as-is; but I'll be taking the gas system back off and running it single-shot as a golf ball launcher.
There were a few more uppers and four or five more lowers that were so short-lived that I can't even remember how most of them were configured. (Other than lots of cheap parts and most of the lowers being based on TAC-15 receivers.)
So, my progression was cheap, cheap, higher end, and then, with my needs properly met, back down to experimenting with cheap parts or "how low can I go before I screw myself?".
But when it matters, I spend the extra pennies and buy good parts.
Looking at it from a different angle (and ignoring the first pistol), I went jack-of-all-trades, purpose-built, and then to screwing around with experimental cheap stuff.
Right now, I have an Aero Precision receiver set sitting here with a few parts gathered for the build. So far, none of the parts are cheap, or from questionable retailers/manufacturers. No skimping on this one -- especially while
good parts are so cheap!