Prices depend on what you need. Many variables come into play when you're considering your rendering budget. Quick photoshop chops can easily handle a wheel and paint change but often aren't great for high-resolution garage art. If you like unique art of your project that looks like....well, art and can be converted into a large format poster then a rendering is what you need. When you start looking at multiple variations of paint and wheels, add in complex body mods, custom interiors, one-off wheels and project management, you can drive up the price. I've worked on quickie projects that were $150 and I've worked on major design projects that were in the $9K+ range. Most projects are under $800. More time=more money.
Liz Miles wrote an article featuring many of the artists/designers that hang out here. Here's a link, hopefully it helps out. If you have further questions, give any of us a call.
http://www.popularhotrodding.com/hot...ce_design.html