Do as veedubfreak just mentioned, it's not that difficult. I have the 900 case and although its a bit tight there is room behind the mobo plate once you cut some access holes, there is also a fair amount of room behind the drive bays if you cut an access hole or two for them as well. Most of my wires are pretty well hidden.
Also, you might want to consider painting the inside of the case if you're going to go through the effort of cutting and sanding with the dremel, cleaner look. I went gloss white which I think is cool but flat black looks really mean as well.
