The 8600 case is the same as the 9600 just a different motherboard. Very easy to get into compared to the 8500/9500 towers. There is a special bracket over the power supply for a HD that is getting harder to find, you can also install a HD in the 5.25" bays I think with the standard trays.

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I just went to install a 2GB Seagate Barracuda and installed it on the bottom of the case. After further inspection I found that bracket on top of the power supply you mentioned. It brings the total HDs I can installed to 3 in addition to the Zip and CD-ROM already installed.

I am going to power it up in the next little bit and possibly install something on the HD.