I use ES2 Electrical Flat Rate.
http://electricalflatrate.com Excellent for service work in the light commercial/residential realm, and the members forum is awesome. It's $99 a month and you can quit anytime if you don't like it. James Brush is the developer and very personable and helpful.
I've never used TurboBid but Bill Ruffner (the developer)is very personable and helpful as well. If I did larger scale work I would probably own it, as Bill has been right there through the years I've been deciding.
Both of these guys will get to know you as you're deciding, and neither are hard sell types. I have great respect for both.