The best area of concentration is the one that matches your interests and what you like to do.
Look in the mirror. Figure out who you are by what you like, and follow that dream. The best business for you is the one that fits who you are.
Tim Berry is the chairman of Eugene, Ore.-Palo Alto Software, which produces business-planning software. He founded Bplans.com and wrote The Plan-As-You-Go Business Plan, published by Entrepreneur Press. Berry is also a co-founder of HavePresence.com, a leader in a local angel-investment group and a judge of international business-plan competitions.