as I mentioned in the other thread... the MOJO sights are a great replacement. You can mount a scope on one, but its not really a good candidate for scopes. You need to get a bent bolt (most likely). If you get a mounting system to replace the existing front sight you need to get a long eye relief/scout scope. If you get the PU sniper style scope, its pricey, you need to drill the receiver, and you have to get a bent bolt for sure. You also lose the ability to use stripper clips.
In the end you are probably just going to shoot cheap surplus ammo out of a gun made hastily by the millions...so its not like you will be shooting a tack driver. If you are going to get sights, I would check out MOJO's... or simply mod the front sight post. Save spending money on mounts and optics for a better base rifle.