I like the Node 605 as well. I don't like that it doesn't take a standard optical drive though.
Right now I'm using a Monueal 312B.
Here is my original build:
The 2.5" Laptop drives have since been replaced by 3.5" drives and a 2.5" SSD for boot. I also have a new custom PSU backplate to accomodate my full sized Hauppauge Colossus. One of these days I will get around to taking...
No problem with the fan here, but I will second Glangford's suggestion of cleaning it first. While your at it, see if there is a label with a model number on it. You should be able to get the specs online. One problem is that there aren't a lot of quiet 60mm fans out there that push a lot of air. The only ones that I recommend are the SilenX IXP-34-16. Of course, this assumes a 12V fan and 25mm of room to mount it. I used one in my HTPC and it was quite good.
I was looking hard at their cases, as well as Wesena and Streacom, in anticipation of a HTPC upgrade. A little more expensive for me, as I would have to import to Canada. I'm not too off put by the price, as it will be going into a high end audio system, but I'll wait until I have the new server hardware finalized before I spend that kind of money.