If you use the search function, you will find literally thousands of posts about this very topic.
I sell more AK type rifles than anything, and am a huge AK fan.
The best AK rifle for the money is a Tromix converted Saiga. In all honesty I would put one of our custom conversions against any other AK in the world. Price wise they are still very reasonable, and are in the $600 on up range. Accuracy is excellent, and is second only to the Vepr. They are actual Russian built guns, and they are my current favorite. I like them so much that I signed up as a distributor.
I sell a lot of WASRs and equivelent Romanian guns. They are okay. The main thing they have in their favor is that they are the cheapest. Fit, finish, and accuacy is going to be the worst of the bunch. All of those variables is going to depend on the individual gun. Some are worse than others.
If you want to stay traditional looking, but with better quality than a Wasr, get the Vector. Vector guns are well made, and they have a great warranty. Price wise, they are in the $500 on up range.
Veprs are the most accurate AK in existence. They are heavy, but not bad. The downside right now is that Robinson doesn't have any more to sell, and they are no longer the importer. There will be a new importer of Veprs later this year.
Bulgarian guns are nice (Arsenal) but in my personal opinion, I think they are expensive for what you get. I also sell these for when the customer insists on a milled receiver, but I think the whole milled receiver thing is overated when it comes to actual performance.
Seriously, do a search. You will read for days.