Trendy Yet Business-like?

I`ve seen a cut that I think is a cool combination; it`s pretty versatile and based on the cut you have now, sounds like you could pull it off well. The top is kept long, the sides come down to the ears but are undercut to a short length underneath. The back, right about earlength tapers down to a neat short in the back. For business time, you use pommade or gel to slick back the longer top, exposing the undercut sides. The slicked hair blends in and gives the illusion that you`ve got a cool professional look. Whenever you`re not in business mode, you`ve got the longer stuff for when you want it.
The closest pic I can find for what I`m trying to describe is http://haircutsformen.com/buzz/haircuts/buzz108.jpg. This cut is not quite as polished as the one I`ve seen.

A second option is to get a long layered haircut. Long layers on top and much shorter on the sides and back. Again versatile enough you can go slick for a shorter, conservative look when you want.
http://haircutsformen.com/buzz/haircuts/buzz09.jpg

Good luck.

Another Matt