HP isn't marketing its dx2300 business PC ($563 direct) specifically as a small-to-medium-business (SMB) PC, but at such a low price, this well-equipped model seems a natural fit for the SMB category. Although the dx2300 comes with an aging Pentium 4 processor, the system's expandability makes it forward-looking. It can be equipped with a next-generation Core 2 Duo processor for more demanding users, but even as configured here it will keep your clerical and frontline workers productive for years to come.