Duet vs MOTU Ultralight for Logic 8/Mainstage?

[MarkVukalcic]

Newb to Macbook at live gigs; need flexibility, ie home studio(90%),;):confused: with about 50 high end(nice hotel lounges)gigs yearly. Need inputs for keys, several mikes for vocals, sax, and MIDI. Have a Macbook
2.4 GHz, Intel core duo, 4 Gb RAM, 250 Gb HD, 400 FW + USB 2.0 x 2. Also, need ext HD suggestions. Thanks

[NewSc2]

Jeez, do some research? The Duet only has 2 XLR inputs and 2 instrument ins. Google is your friend.