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I also have a Marlin 30-30 and it's a great little brush gun. I had a 3-9 scope on it which I eventually took off. Not to discourage you, but I would agree that the iron sights are just as good at "short" distances with this thing. If I were to put a scope back on it, I would probably consider a 4x relatively cheap one (Redfield used to make a 4x that was high quality and good value - I'm assuming they still do).

Hog hunting with this thing is a pretty quick process and you don't have time to dial in with the scope. 4x is a good compromise for all the shots you'd want but more simple than a 3-9. Just my opinion, for what it's worth...