Best bet is to pick out a few and read reviews. But from a quick look, I'd go for this Sony for $300

https://www.amazon.com/Sony-KDL40R510C-40-Inch-1080p-Smart/dp/B00V0K0Y00/ref=sr_1_6?ie=UTF8&qid=1467766121&sr=8-6&keywords=40+tv