Get one that has a Static Hardrive and Serial Port
Most PLC software will run your HD a lot more than Windows. Siemens is notorious for that. I would try a static drive for a change. DELL has that as an option. That being said I have a Systemax from Tiger Direct (you can try Microcenter.com also) with CA (computer associates) installed operating system (without all that bundle Software that others put in). It is not perfect but does most jobs that don't require heavy serial port use (times out every 5 minutes on the replicated port).
Most PLC software will run your HD a lot more than Windows. Siemens is notorious for that. I would try a static drive for a change. DELL has that as an option. That being said I have a Systemax from Tiger Direct (you can try Microcenter.com also) with CA (computer associates) installed operating system (without all that bundle Software that others put in). It is not perfect but does most jobs that don't require heavy serial port use (times out every 5 minutes on the replicated port).