Seems like Dremel did the 3DPer first because it's all the hype, but with desktop CNCs like Shapeoko, OtherMill, NomadCNC, etc. coming out, and Dremel being ::the:: company of mini-router spindles, they'll probably come out with desktop CNC mill soon.
$2200 for the Othermill and $2500 for the Nomad for what amount to hobbyist machines seems way too high, especially for being unable to cut steel, and having such limited tool sizes. I'd also venture a guess that the speeds for cutting aluminum are pretty slow, and you're probably taking very thin passes.
For $3900, you can get a proper mill with a retrofit kit, controller and software:
This will cut steel, accepts tools up to 7/8", has a 1HP spindle motor, a much larger work volume, higher feedrates, etc.
I realize that there are plenty of applications that can be satisfied with wood and plastic, but making precise metal parts are really the killer app of CNC Mills.