It's best to experiment a bit with less expensive wigs. A place like Golden Hair Beauty Mart carries a ton of wigs of all kinds of wigs, falls, extensions, etc. they are geared more toward ethnic clientele, but there really isn't a great difference in synthetics especially.
With synthetic hair, their life span is not so great. I typically get a month or two out of synthetics. I generally use falls or 3/4 wigs and leave my own hair out in front.
Human hair is not equal. There is human hair blend, human hair, remi, virgin remi. Virgin remi is basically hair taken from the donor and kept with hair going in the same direction and minimal processing. Remi is better hair. Just plain human hair tends to tangle more and often has been treated with many chemicals. Human hair blend is synthetic and human hair-kind of the worst of both worlds.
You can find remi units on ebay and amazon. You can contact the seller and get it customized if you like. These units all come from China. The Chinese are the primary wig producers these days. So if you get a remi wig advertises as "Indian Wavy" or "Italain curly" it is basically Chinese donor hair processed to a certain curl/wave. The quality of wig hair has fallen off due to the demand for wigs, weaves, extensions, etc. but I've still got some ok remi wigs for around $200-300 and they have typically lasted 6 months with good care. I temd to conditioner wash human hair and it keeps the hair from drying out.
As for style, women used to chop their hair off in middle age, but that is not as common now. Experiment a bit and find what flatters you. Hope this helps!