usb network cards/ enlarged dongles

[lerninlinux at comcast.net]

Has or does anyone use the usb network cards/dongles?  I have a box that is going to be an 
entertainment center unit (since my 1700xp wouldn't underclock) on a matx motherboard.  It doesn't 
have on board networking unfortunately, and I only have three slots.  Need one for the tv tuner 
card (may put in a second one if I find out that the tivo functions work, ff, pause rewind), and 
one for the ultra ata card, as motherboard has 120gb limit and I want to use my 160 drive.  Third 
slot wants to be a second tv tuner card, depending on the answer.

Thanks
Randal