you could run power to the computer from the same lead, share the grounds and you can possibly avoid having any alternator whine...
power the hubs for sure... the 1.1 vs 2.0 issue has more to do with the quality and specs... I have an old 1.1 thumb drive that doesn't slow down my ipod... but that is on a $50 Belkin hub... not the $5 ebay model...
for simplification I went with a 4 channel amp, less wiring... one power wire and actually just one set of RCAs - the amp can work in 2 channel mode, not to be confused with bridged mode... it basically just duplicates the left and right for both the "front" and "rear" channels... I got the RF P4004 which is rated at 4x50 for 4ohms...
I also used the remote turn on lead this time, the part that sucks is that after you kill the key the computer stays on for a bit... depends on your power supply, but I am going to rewire this weekend to have amp kill with key - not sure how I want to go about it... but I just don't like the idea of walking away from my car with music still playing...
oh, and I like you attention to detail... I presume that you drive a 5 speed manual...
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EPIA SP13000, 512 DDR400, Seagate 300GB, Belkin PCI 802.11g w/external antenna, Holux GM-210 GPS, XM Direct w/ serial, Dlink FM, Opus 120 p\s, Rockford P4004 amp, Xenarc 7" VGA touchscreen custom mounted in double din spot --
see pics and write up here!!