Recommend the esprimos. Fujitsu is very honest in their energy consumption white papers so you can know exactly what they'll draw.
Also their mainboards - as far as I can tell - have always been atx wrt screw holes, so you can put them into larger cases. Problem then is that the psu is proprietary regarding both size and connector. They've been doing 12V only to the mainboard for a couple years now, and convert to other voltages on the mainboard. But replacement parts are cheap and plenty on eBay, so don't worry too much.
Also their mainboards - as far as I can tell - have always been atx wrt screw holes, so you can put them into larger cases. Problem then is that the psu is proprietary regarding both size and connector. They've been doing 12V only to the mainboard for a couple years now, and convert to other voltages on the mainboard. But replacement parts are cheap and plenty on eBay, so don't worry too much.