I would figure that you would need to wait for wine to support IE8 first, wine barely runs IE7 let alone 8.
take a look at the Wine appdb for details of how well versions of IE run currently:
http://appdb.winehq.org/objectManager.php?sClass=application&iId=25
If you're looking for a general purpose browser, your best bet is to use something that runs natively, like firefox, chrome, opera, etc. IE should only be used on wine if a website absolutely refuses to work on any other browser (I have seen a few of those). Also if you like the appearance of IE, firefox has a lot of theme/IE appearance mimicking plugins you can try.