Back when I was trying to figure out recording video for youtube I picked up one of these as a backup plan...
http://www.ncix.com/products/?sku=62...nufacture=ASUS
Unfortunately I haven't tested it with a microphone. I can sure vouch for the sound quality though - I use it with my laptop at work, and like most laptops the sound output is underwhelming. The built-in amplifier on this device makes a HUGE difference.
Probably a few bucks more than the Logitech device, but if you also plan to use the headphone jack totally worth it IMHO.