Keep in mind when choosing a wig that those cheap wigs are VERY thin on top. Trust me, I have a few. They are good for some things, but not for others. For this style, you might want to avoid them as they won't give you much hair to work with.
Looking at the hairline at the front, I think you will want to avoid wigs with a fringe or a centre part or any style that goes down at the front. If it has a skin part then it will automatically want to sit flat into the parting. It looks like it should be smooth at the front, so you might want to go with something more like this:
http://cgi.ebay.com.au/New-100-Pure-Vanity...oQQcmdZViewItemThat's from a seller based in Australia. You will be paying a bit more for their wigs, but they are good quality.
You can see in their pic and their description that the wig has a smooth front so that when the hair is styled back, it will give a look close to what you want to achieve. It also says that you can move the parting, so it's not stuck in one style. Sometimes if it's stuck in one particular style, it is hard to remove. You want something that looks as close to what you want. It would need to be cut and styled though. Hairdressers will cut wigs and usually charge the same as they would for a normal haircut. As for styling it, I'm not sure what to use on synthetic wigs to keep a style like that in place. It won't behave the same way as it would if it was real hair, so be careful what products you use on it. I don't have any experience with styling products in synthetic wigs unfortunately, but I know there are forums around the place that can give you some tips.
Good luck!