USB audio out for laptop - Cakewalk UA-1G vs M-Audio fast track or any other?

Im looking for a usb audio interface for my notebook that will give me better sound on my headphones than the built-in soundcard. basically I need it to play my music to potential clients when on the move.

I have seen a couple of usb interfaces in my price range - 
- Cakewalk UA-1G 
- M-Audio fast track

Which would be a better choice? Or is there another option in the price range?

There are "regular" PC USB "sound cards" available.  e.g. SoundBlaster has one.  Some audio interface units will not work with standard PC audio or won't work with all PC audio.  e.g. my Roland Octa-Capture or my MAudio Fastrack Ultra 8R (both USB) will not work with Goldwave (an audio editor) or Windows Media Player.  If I try to play audio from these applications (and may be others) I do not get audio through my recording interface units, I have to use the PC's sound card and speakers.

The Focusrite VRM box needs an S/PDIF connection, unless you have that it wouldn't work for you.  It emulates various speaker systems. 

http://www.amazon.com/Creative-Sound-Blaster-System-SB1240/dp/B004275EO4

At the lower end of the interface scale quality is all about the same.  Any music interface should work fine for your purposes.  Just be sure to get it from a retailer who will let you return a model for another one in case you do have a conflict w/ your computer.  You shouldn't, but it is good if you do.

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Thanks for all the inputs they were a big help indeed! Babyface looks supercool but too expensive for my needs!

if you have expresscard : echo DJ 

Because I use a laptop for live performance this was something I have played with over the years. Believe it or not, Some laptops boring old mini jacks are totally up to the task of playback of audio files. I use Win Amp. I tested a few laptops, If you install an audio editor like wave lab, and put it into record with nothing plugged in and the mike muted, you'll soon see what the noise floor is. 

My first laptop an Acer had a terrible hum and noise floor so I tried using an audio interface and the stupid thing would crash on me. 
I had borrowed a friends Mac Book and it was dead quiet? I then borrowed everybody in the families laptops and found it was hit and miss. 
The quietest was my sisters Asus. So on a chance I bought a Asus netbook. It works. No Hum, no noise floor. I play it LOUD through a PA. Mini jack and a realtech sound card. So 
before you spend money on something that will be a PITA to drag around, see if you can score a netbook or Tablet that just happens to be OK at audio. 
Those Express card options are also a good idea, but I found them expensive for what you got.