You are correct. There is no substitution for real hair. Whether it be human or animal. But a good quality synthetic can be used with most hair products. Like I said before. It's all in the styling of the wig... Well, and knowing how to wear one. I'm a theatrical costumer by trade, and tho I let most of the hair lessons from school go in one ear and out the other, I did pick up a little from the wig girls at work. Tho I usually try to bribe them to style my wigs for me.
But to give you an idea of cost sithlord, I have two wigs currently. One is a cheapo from party city that I made into a pirate wig, and the only reason it works is because I dreaded the hell out of it and wear a bandana around it. The other is a synthetic modacrylic that I got for free from the aforementioned wig girls, and it is very realistic looking and styles easily. The price tag was still on it tho. $120.00. So expect real hair to be more. Yak would be the next step up from that, and human from that. Toby can probably chime in on this one as he has pretty much run the gamut from cheap synthetic to human in his search for the perfect Capt. Jack wig.