Originally Posted by Dave does lawns
Besides I have found in my experience that by me linking to other sites weighed just as heavily then those linking to me.
Focusing on relevant outbound links is important for more than just SEO. A visitor will see you in more credible light if you have links to trade organizations. They may even follow them and gain value from the site.
Linking to local businesses also provides value. Visitors may see it as a recommendation of a quality professional they may be interested in.
How about linking to a resource guide that is relevant to your services...