I have owned M1As, FALs, Valmets and a Galil over the years. All had their strengths. I currently only have a HK91 -- the same one for the last 20 yrs.
There are an abundance of G3 parts and mags available at very reasonable prices. The original HK scope mounting system is not ideal, but it works acceptably for me. If you can locate an acceptable HK91 clone in your price range, I think it would meet your needs. Five round "hunting" magazines are available from a few sources.
In S. Texas, the HK91 w/ a S&B short dot, HK 30mm mount, has proven to be a very good hog and deer rifle. Spuhr makes several excellent "upgrades" should you desire.