@Daniel Hofmeister Hey Daniel. I just purchased my first duplex as well! Congrats on getting to contract, hope it goes through for you!
I've had the same question about LLC. I've flip flopped several times on getting one. After doing some research, here's what I've decided to do. For my first 2 rental properties, I'm not going to do an LLC. Instead, I got $1M of umbrella insurance for an extra $280/year. This insurance sits on-top-of my other insurance (car, auto, rental, etc), and acts like a reservoir should one of my other insurance limits be reached.
Why am I waiting for rental property number 3 before I go LLC? Right now I'm trying to keep things as simple as possible to reduce any barriers to jumping into Real Estate. And, the smaller you are and the higher your debt/equity ratio is, the less likely you are to get sued. An attorney isn't going to waste their time going after you if they know the bank has first dibs on all your debt (tenant could only go after your equity if you were sued). As I get bigger and become a bigger target, I will for sure go LLC.
One last thing to note. I called my Lender about possibly transferring the Deed into my LLC, he said they would let me transfer to an LLC, but they will have the right to call the loan if they wanted to (but said they "most likely" wouldn't).