You haven't mentioned your intention or preference. Will you be distance targeting(sniping), CQB, suppression, do you prefer NATO etc.?
If you want long range NATO accuracy then I'd recommend taking a look at M1A's(M14s) or even AR10's if you'd rather have that layout. The 7.62mm NATO is a very accurate and high velocity round that has very good flight characteristics. If you are looking for something less expensive (weapons wise) then I'd go with the Remington 770 7mm mag as the weapon/round is accurate and the round doesn't drop off like the 30.06 at longer ranges.
If you are going for CQB(close quarters combat) style weapon then I'd go M4(5.56mm NATO) because they are very accurate lightweight platforms without high penetrating capability such as your 7.62mm.
If you would rather have the Kalashnikovs then I'd go with Russian over Chinese or Czechoslovakian. Avoid getting a used one unless you can test fire many rounds through it first.
Just some thoughts as it really depends on what you intend to do with the weapon. Also, whatever you decide, please ensure it is done legally and safely.
Happy hunting
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P.S. An accurate weapon is a deadly weapon