Ok, what price range 450ish to 1000+, caliber .223, 5.45, x39, .308, x54r, 410, 12ga? Decisions, decisions.
A Chinese straight cut Mak90 is a decent one, 1.5mm receiver, slightly heavier barrel than it's European counterparts and a sweet factory double hook trigger, most other Aks are single hook triggers, they can be get pricey, 7-800 or so.
A Yugo OPAP M70 is another heavier built variant, 1.5mm reciever and usually has a scope rail.
A Romanian WASR or Yugo NPAP are fairly decent for a starter Ak, some love'em, some despise'em. They are one that allows you to decide, yea, I like this platform and keep it, move up, or move on. Or just break bad and go all out, a SLR107, Bulgarian and get your drool on.
Maybe go outside the box,
Vz58, machined reciever, and a pound lighter than an Ak. I'd hand an Ak over before either one of my Vzs. Sorry, it's NOT an Ak, I know.
It's an Ak, even cheaper lower end ones will typically work decent
. Most pieces and parts are interchangeable with some fitting. One of my Mak90s wears Romanian wood and a Bulgarian grip, I have a wood Polish grip also that fits. I mean the factory bunghole stock is, a little ugly, it's tucked away in a box. It took some fitting to get the Romanian wood to fit the Chinese due to slightly thicker Chinese reciever and slight design differences.