Everyone has different needs. I like a silent computer, although I do like having one HDD in addition to the SSD. The HDD does backups late at night, then stays powered down when not in use.
Since I like running VMs, I prefer having a good number of cores and RAM. That way, the VM can be by itself, and not affect other items on the system, even when playing games or running something fairly heavy like Photoshop. Plus, when I browse the Web in a VM, if the VM gets compromised, it will just hose up itself and maybe the NAT segment it is attached to, not much else. Of course, using a SSD (I prefer Intel, but other brands are probably just as good) doesn't hurt either.
I have been toying with the idea of building a box with a lot of RAM, drives, and using it for iSCSI. That machine would be where I move most of my VMs to, as well as handle backup server duty. If I ever so chose, I could drop in a SAS card and go with tape for permanent backups.