Account Edge
We've used Account Edge Networking addition for 10 years now with up to seven users at a time. It is great software from an accounting and reliability aspect, but if you ever intend on using more than two CPU's/users at a time accessing the accounting database, be prepared for some slow computing. If you look on their forums, that is the number one complaint with a lot of people leaving the program. But I see no other alternative out there for the mac that is that powerful far as feature set. It just runs really, really slow in a network environment. Their common answer is, T1000 based ethernet, no wireless, Intel Duo at the minimum, dedicated quad core server, etc. And from experience I can tell you if you don't do that, you will be really frustrated at how slow it can be. Literally I have people waiting in line to be able to post something on a busy day. Yet with all this complaining, it works great in our work flow of tracking time on a single project from multiple employees and bring all that info into one invoice really easy.
I use iBank for home accounting and love it. If iBiz had more features, I would go with it. They are very responsive to user input and are priced reasonably. If your needs are not that heavy, lots of inventory, payroll, etc. I would try iBiz, otherwise go for account edge.
