Reliability problems are rare with pretty much any AK, even the cheap Romanians, and are usually easily remedied when they occur.
About the only things to change as you go up in price is fit and finish and accuracy. The WASRs do about 4 or 5 MOA @ 100 yards while the MAKs do 3 and the VEPRs and Bulgies can get down to around 2 MOA.