I have enough money to buy a nice tv but I have no idea about them and my boyfriend doesn't either. How to chose without getting taken advantage of?

I want to buy a nice tv and I went to 2 stores and I sort of felt like the guys serving me were talking whatever they wanted to sell and not what was the best for my budget? How would I go finding out what's best to buy?

I have enough money to buy a nice tv but I have no idea about them and my boyfriend doesn't either. How to chose without getting taken advantage of?
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