I would personally avoid the P4 chip. They are power hogs and will cost you 
more money in the long run than getting a low-end core 2 duo - which should be 
faster and not much more money. Make sure you keep power consumption in mind 
when you pick up a power supply and video card too. The always on computer 
should be fast but light on power usage. 

Also, I would avoid the hardware raid. Raid/z on top of the raw disks will have 
much better fault tolerance and will allow zfs to fix silent read errors. It 
will also allow solaris to tell you which specific disk is giving you problems 
and allow you to replace it where having zfs on top of hardware raid-5 will end 
up hiding which disk is acting up. 

I have a similar setup to what you are looking at. I have a sun ultra 20 with 
an 80GB system drive, 3 - 500GB eSATA externals in a raidz and an external 500 
GB usb drive setup as another zfs pool without any redundancy (I'll mirror it 
in a few months when I get more money). I do fine with 1GB of ram, but 2 would 
be better. My network is gigabit and the setup that I have serves multiple 
computers easily streaming video and files. As others have said, I would avoid 
32 bit. If you are worried about maturity of the platform, you may want to look 
at AMD chips instead of Intel. They have been throughly proven out in 64 
bit...although Sun will soon be selling Intel chips, so they will be proven out 
too in short order. 

Eric
 
 
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