That's what happens when you ask about render programs - soon you get a long list of what's best :)

Seriously, download the Hypershot trial. It is fast. As for quality, take a look at their gallery. There is a reason many major automobile makers and major design/marketing firms (including exotic car designer Pininfarina) use it. Time is money.

For the latest example, look at Gulfstream's new jet. All Hypershot renders from production CAD data. Also, check out the turntable animation by clicking on Technology > Engine
http://www.gulfstream.com/gulfstreamg650/

Ed