yep tirerack has the cool feature of being able to check out rims on your ride w/o having to photoshop them yourself. Only thing is I wish they had a wider selection of wheels. They have alot already but the prices seem to be on the high side. I have bought tires from them though, they've got some really competitive prices even with the shipping price added.
This is an Australian site so your car may not be featured (depending on what you drive) and will only feature the wheels that are available for your specific model but try http://www.bobjane.com.au. You will need flsh 6 plug in which is available when you log onto the site
Age Verification
This website contains age-restricted materials including nudity and explicit depictions of sexual activity. By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.