You've got your facts a bit twisted up.
First, Romanian WASR's are generally bottom-of-the-barrel AK's.
I'm not aware of any AK made in the US, but maybe Arsenal (pricey!) Century and a few others assemble them from parts kits. I'de avoid the hit and miss chances with those.
SAIGA is the original, and the best bang for the buck. You can get a brand new SAIGA (as opposed to one assembled from parts kits which may be used or decaying or abused and butchered) and convert it yourself. The SAIGA IZ-132 is 7.62x39. They also have a 5.45.
Put a little work into it, as you can afford it, and you will be happy, and you will learn a lot about the gun too.