Newbie AMP Question

I am new to all this and hope that I am posting in the correct forum. I Have just purchased a pair of Grado sr255's and completely love with them. I was content with listening to my Shure SE530's right out of my ipod and macbook but I want more out of the grado's. I have a macbook and will upgrade to a macbook pro when they come out , which is soon hopefully. I am looking for an inexpensive but nice sounding solution to get the audio out and amplified. I have a Canopus ADVC 110 from a project that I did. These are the specs;

Technical Specifications:
Video Formats*
* NTSC: 720x480 @ 29.97fps
* PAL/SECAM: 720x576 @ 25fps
*ADVC110 accepts SECAM video input only.
Audio Formats
* 2-channel 48kHz 16-bit
* 2-channel 32kHz 12-bit
Digital Video Input/Output
* 1 x 4-pin FireWire (100Mbps)
* 1 x 6-pin FireWire (100Mbps)
Analog Video Input
* 1 x S-Video (4-pin miniDIN)
* 1 x composite (RCA)
Analog Video Output
* 1 x S-Video (4-pin miniDIN)
* 1 x composite (RCA)
Analog Audio Input (unbalanced)
* 1 x stereo (RCA)
Analog Audio Output (unbalanced)
* 1 x stereo (RCA)
Power Source
* IEEE 1394 bus powered or DC5V from EIAJ#2 DC jack
Power Usage
* 4.5W

Is it possible I could use this with something else? or is it not enough? or even wrong for this purpose. Please forgive my ignorance but all this is very new to me. Any advice is appreciated.

 

Lack of Response Answered my Question

I dug through this and other forums and based on my present and future needs I bought a Apogee Duet. I was able to get one new for $400. I am hoping that was a good deal. Anyone else have an Apogee Duet / Grado setup?