Dell optiplex 755 , 160GB HDD, 4GB RAM, CORE 2 DUO ?

I have for sale several Dell optiplex 755, which work perfectly. I have installed windows 7 and Microsoft office. Spec (for 3 of them) 160GB HDD 4GB RAM Core2Duo, ATI graphics 19-in-1 memory card reader (reads all memory cards) Spec for a separate dell optiplex 320 (80) 80GB HDD 2.5 GB RAM Pentium D dual core I can give 17" monitors with each one for an extra 30. If you have any questions. I will accept reasonable offers. Thanks for viewing.