I have four audio interfaces here, an M-Audio Firewire 410, an M-Audio Delta 1010LT, a Hoontech STA ADC-DAC 2000 and an IK Multimedia Stealthplug.
The Stealthplug is a good little interface and very portable but it is USB. Simple though - 1/4" phono one end, USB the other end and it just "works". It's pretty quiet and provides single channel ADC and DAC.
The Firewire 410 is definitely my favourite! Portable 4 in - 10 out interface, two mic pre-amps and it has those NuTrick XLR/phono connectors. It has become my primary interface in the studio as I tend to just use the laptop for all of my work now and it's portable, happily running of the power supplied via the firewire port on the laptop.
The STA and the 1010LT are both PCI solutions, the STA with a nice 19" breakout box and the 1010LT with flyleads that I have running via a multicore to a Fostex line amp in my rack.
I am thinking of selling both the STA and the 1010LT at the moment as I just don't use them now, nor do I use the PowerMac G4 dual 866 they are mounted in. I dont have to mic up a set of drums so the four inputs on the 410 are sufficient for any work I do now days.
So, they are all 24/96 ADCs but as I say, the 410 is portable and the Stealthplug is physically a "cable with a lump one end" and can be left in a guitar case.
Anyone interested in buying the 1010LT or the STA can drop me a line. I'm on the verge of sticking both on eBay to help fund the Thorens repair.