Reply to USB Powered Hub for two X1 and External HDD

Hi to all, i'm believeing to buy a couple of X1 and a MacBook Pro but the only two usb port on the macbook it's a trouble...
Today i use an Asus X59SR (P8600 2,4 Ghz processor FSB 1066 MHz, 4 Gb Ram 800 MHz) that have 4 usb port so i can use all my device (audio8dj, external hdd and in future 2 X1) but with the macbook upgrade i lost this possibility...
In NI community i've read that some user use two X1 (or also A&H 1D) with and usb powered hub (1800 ma), so i ask for advice on the purchase of this device.
Know any good powered hub with which I can use two X1 and an external HDD???
Thank you for your attention and for assistance...

Alex