The thing that can make your professional logo design really jump out of the computer screen or off the page is the colour. 3D designs in particular can look really stunning, with excellent use of colour and an amazing finish. Every company logo should also look good in black and white as well as colour, but colour is most important as the vast majority of people will likely see it in colour as opposed to black and white.
A key, though, to making a logo that looks good in black and white too is to avoid using too many different colours in the design. Most of the best looking logo designs have only two or three colours.
The colours should be bold in most instances, with a brightness and vibrancy that makes the design really shine. There are designers available that can handle all of this stuff for you, though, so that all you have to do is state your requirements and pay your money, before sitting back and waiting for the finished article.