I get a lot of questions about wigs and i'm not really a expert in that area.. But here are my tips when getting a new wig.
-Kanekalon wigs usually looks the best
-Make sure they are heat resistant
-Look at the pictures do they look shiny? Maybe then you should look for a other wig it will look more natural if it doesn't shine so much.
-Prices it's more up to you and what you are willing to spend. But ebay is a really good place to get cheap but good looking wigs. Just make sure the seller in question have good feedback ^^
I also really like gothiclolitawigs but they cost a bit more than those on ebay.
-How to store your wigs (i'm really bad at this haha) try to keep the original packing and keep it in the plastic bag when you are not using it since wigs collects dusts and then your wig will get dirty faster.
-If you want to wash your wig use baby shampoo and conditioner please notice that it might take a long time for the wig to dry so wait a day to be sure. Then you just brush you wig carefully with your wig brush and it will look a bit better ^v^
Hope this was a little helpful at least ^-^ ~