Hey Bryce,
I recently bought both a Vizio and Samsung tv (both under 50"). The samsung was a smart tv and I have really enjoyed that. It is also a better all around tv. However, it was almost 350 dollars more expensive and I don't think it is that much better! I currently play Xbox One on my Vizio and absolutely love it. I was surprised by how dark the darks were and how vibrant the colors were. As state, the Samsung is a much better tv, but for your dollar you can't beat the Vizio. I also have a 40" Sony tv and have enjoyed that. It has been really good to my family and hasn't had any problems going on 7 years. We also own a Philips, and it is okay. For the money I would say Vizio is your choice if you are not looking to spend a whole lot. You can actually get a good Vizio for much less than your 600-700 range (got mine on clearance this past spring for 425 dollars for a 48").