There is no “The Chart” for AK’s (thank God).
That said, yes…some AK’s are put together better than others.
If you want a higher-end underfolding AK, I agree…Polish AK’s are very nice. Just make sure you get one from a reputable builder. Good Polish underfolders are hard to find for under $700.
You can also find some Chinese underfolders and Arsenal (Bulgarian) underfolders if you look around. Those will cost more ($800+), but will be solid rifles.
At the lower end, Yugo M70AB2 rifles can be readily found at several dealers for around $500. Don’t let the price fool you…these are good rifles, too. True, they do not have chrome-lined barrels. But unless you’re going to be putting a serious round count through the rifle in a short period of time, I wouldn’t let that stop you. If you take proper care of it, the rifle and its barrel will outlast you.
Since you’re new to AK’s, I would start with the Yugo and see if you like it. If so, you can either sell it at a later time and upgrade it, or keep it and move onto higher-end rifles as your interest and budget allow.