Conclusion: Though it doesn't have all the bells and whistles of one of those Sandy Bridge desktops, the HP Compaq 4000 Pro desktop has just about all the things your small to medium-sized business needs, at a fair price.
Pros: Compact chassis. Some expansion room. Space for a second hard drive. Dual-monitor support built in. Has a 12-month product cycle.
Cons: No TPM. Half-height expansion cards only. Only two memory slots. No eSATA or DisplayPort.