The thing that makes firewire better than USB is the fact it's full Duplex, like an ATA or SATA drive and doesn't tax your CPU.
I only need to plug-in my iPhone to sync it with audio going out of my Mbox2 and I get noise out of it's audio driver.
If you look at the attached image, I did the very unscientific test of copying 2Gb of files from my USB 2.0 drive to a 7200rpm drive on ATA Bus 1, the CPU usage was consistently 25%.
When I copied the same files from the 7200rpm drive on ATA bus 1 to the another drive on ATA bus 0, the CPU usage was consistently about 10%.
Point proven!
Yeah, like I want to pay up the wazoo for some tiny SSD drive when I can get a 500GB 7200 RPM drive for $40. I'm getting 110MB/sec sustained transfers for my $40 too and it's dead quiet. People who think they "need" SSD probably think they "need" an 8-core Mac Pro with 22GB of ram just to do Ping on iTunes. Meanwhile, my Hitachi is working great with Logic Pro here. 🙄
I half agree about the 7200rpm drives but I think you're missing the point of what makes an SSD good, especially for audio work.
I use Protools LE on a very underpowered old G4
My Drives are configured like this:
1) 7200rpm 250Gb Maxtor 32Mb Cache: 60Gb System (Applications/Software Synth Patches only), 190Gb Storage (General files)
2) 120Gb Western Digital 16Mb Cache: 30Gb Sessions (Recording/Sessions only), 80Gb Audio (Mp3s)
3) 1TB external USB 2.0 drive for back up.
Partitioning a drive so the first 60Gb is for a boot partition and the rest for general storage is going to be no less efficient than how I plan on configuring a Mac Mini based system as my next mac:
1) 60Gb SSD System (Applications/Software Synth Patches only)
2) 500 or 750Gb 7200rpm FIREWIRE drive with Oxford chipset: 60Gb Sessions, 690Gb Storage (General files, MP3s etc...)
3) 1TB external USB 2.0 drive for back up.
This set up will be no different from my current partition scheme, except I'll have a drive that can handle 10,000s of IOPs, making access time a non-issue and much faster patch loading, application loading and boot times while having the same efficiency of not saving loads of files to my system drive, slowing it down over time, recording to a dedicated audio drive (which is essential to start with) and all my general files going on a partition on their own that won't slow down either my system drive or the drive I record to.
I see your point about the Mac Pro, it WOULD be overkill for a lot of people's needs!