Ports Self Powered
A look at what is currently available on eBay
 Doctor Who - TARDIS USB Hub Station 11th Series - USB 4 Port Self Powered US $39.69 
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 4 port USB hub self powered UH-9124 US $1.00
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 PCUSB3 — MINI 4 PORT USB 2.0 HUB - BUS & SELF POWERED US $29.99
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 Belkin USB 4-port hub, self powered (or USB powered) US $10.00
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 New D-Link DUB-H7 7-Port USB2.0 Hub Self Powered, Port Status Output 5V 3A US $24.69
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 NEW USB 4- PORT SELF POWERED HUB US $20.00
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 NEW MicroPac USB-CBBH USB 2.0 4-Port Self Powered Mini US $23.47
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 7 Port USB 2.0 Hub Self Powered (With Power Supply) US $22.99
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 NEW Self-Powered Inland High Speed Pro Mini USB 2.0 4 Port Hub US $6.67
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 Tripp Lite 4-Port USB 2.0 Self- or Bus-Powered Ultra-Mini Hub - Hub - U222-004-R US $28.99
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 USB 2.0 Hub Self Powered 7 Port (150307) US $27.95
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 USB Self-Powered Hub 4-Port UH-124 US $12.49
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 BELKIN SUPER FAST FIREWIRE 6 PORT HUB WITH SELF POWERED AND BUS POWERED MODE NEW US $52.99
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 USB2.0 4 Port Hub Self Powered (w/Power Supply) US $8.00
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Computer hangs if something is plugged in the usb port?
Had this problem with XP-32 and the same with W7-64! If something is plugged into the Usb Port Hub the computer hangs during startup, just before the Windows splash screen. In the main onboard ports (front and back) NO problem, only in the (self-powered) hub, and only if the device is powered up. In XP safe mode where it displays the startup data, mup.sys would be the last thing to display when it froze, haven't tried that with W7 but I assume it's the same thing. I'm fairly computetr literate but this has me stumped. There are lotas of other poeple asking simioar questions but the answers are always guesswork or very simple stuff i've already tried. Why hasn't M$ tackled this?
Check the bottom post by manwe here;
http://www.techspot.com/vb/topic18940.html
It may be of help.