optics

So I picked up a PS90 today and was wondering what a good optic for it would be. I think a nice red dot should do, but I'm looking for something with a small profile and doesn't take up a bunch of space. This is more of a defensive weapon than a long range one so I won't need anything with...

Like the title says, I'm looking at getting a GOOD optic for under $150. I'm not looking to take on the title of world's best spotter so Marky-Mark can make a mile shot with a .338 Intervention in which he kills the visiting president from a foreign country then Danny Glover hires some...