Well if you ever plan on upgrading your video card and you want the AIW features, I'd reccomend the X1800 AIW (if your going to be doing some graphic intensive stuff or gaming). If your not gaming you could always shoot for the X1300 AIW.
I'd say the X1600 AIW would be the perfect card for you, but ATI hasn't released one and doesn't seem to be showing signs of releasing one.