I'm a little ambivalent about them, but the JLD Enterprises PTR-91 is worth looking at.
edit- I would assume that the Centerfire gun is a Century. I know some people have good luck with Century's cetme's and g-3 clones, but I have seen some pretty nasty ones. If you like to fiddle around with guns and maybe have to do some work to get it running, then that's a thought. Otherwise I would stick with a DSA Fal (I'm not that crazy about FALs, but I could live with it), a JDL ptr-91 (some rough edges like the rear sight, loose trigger packs and handguards with no heatshields, but still worth a look), an M1a/M14-probably from Springfield or an AR10.
AR10s are easy to mount optics on and I like the "feel" better than the other rifles mentioned, but the magazines can be a bit of pia.