Microserver works well for me except for a couple small things: it noticeable chokes on concurrent reads and writes over the network and it cannot do any hard cpu work. I decided to see if I can put together a replacement with more power. I still want to have a small package, get an Intel processor, and ECC support. I went looking for a board. There are two of them out there now: Portwell WADE 8011 and Intel s1200kp. The former is a dream with 6 SATA ports, but it’s difficult to find and I saw someone on a forum quoting $390 Portwell is asking for it. The latter is available everywhere, e.g., $170 at Newegg, but it only has 4 SATA ports. Putting it together with a 4 SATA controller card, small case, Xeon E-1235, and a decent power supply, the bill comes to about $800 without tax. Expensive.
The main problem is that I cannot get a good feel if the rig like that would run OSX. There are some small hints on the forums that someone managed to get Lion running on the Xeon, but it’s not clear if that was the same board.