So I started out set on getting a Saiga 12 and making mods to it, but after pricing things out, I'm not sure I can swing $1400 ish right now with a house under construction ... I also doubt I'd find a deal on one locally at a show. I also want to mess around and do some mods myself. I'm very new at that, so it's a little safer to start out with a $300ish shotgun than tweaking the AK style job starting at $600.

So,
What are some of your all's best bang for the buck options for a self defense shotgun. I'm open to any functional size (12ga, 20ga, .410, etc). I'd like to be right around 18" to avoid the NFA junk. I prefer semi auto, but that won't be a deal breaker.

I'd like everything taken into consideration: versatility, aftermarket option, reliability, etc. A sweet looking gun is a major plus.

Thanks in advance!
Chris