Not regarding goggles that it is not essential to buy top of the range, you need a decent lens to prevent fogging, to leave the lens alone and clean only with water to protect the coating. (Anti fog products will gradually remove the manufacturers anti fog coating so don't use them until it begins to fog one day)
Remember fogging is not just down to the goggles, a large scarf wrapped around your neck and up to the goggles or your headwear could be the cause of fogging
If goggles fog a little then you can add a DIY fan using small pc fans a battery and a switch
Other things you pay for with high end goggles is the design, the material and the lens area of view
Much of this is personal and to do with fit & comfort. What fits me and I like may not be right for you
The material can be hard plastic such as rental goggles or soft plastic/rubber which slightly promotes bounce, gives comfort and can be d away when you lean your chin into the marker to look down it
Don't buy the cheapest goggles - but do note that your own pair of rental grade goggles bought new will be much better then the same ones worn by hundreds or thousands of rental players - you will take care of them
Don't feel the need to buy the most expensive goggles -they will be good but go beyond your primary needs
Try goggles on and buy the ones that are comfortable and feel right to you
Very often new players are told to buy the best now and to not be like the rest of us buying this then that.
But if you read the 'sinking money into paintball' thread it becomes clear - paintballers always buy something else next
Don't buy the most expensive thing first. Instead of not wasting money on cheap rubbish, you waste your starting funds on expensive equipment and it depreciates more