I've heard the nuforce icon extensively, and found its amp to be not as good as the T4. Less detail, slightly unresolved overall.
Do you really need the DAC? If you're going to use it with your e260 most of the time, then go for the T4. I also have an E250, and it works rather well with the T4.
If you can DIY, a mini3 is another possible option. Get a full kit from hohodiy like I did if you can't be bothered ordering parts individually and doing casework. I built one, and it wasn't hard. Very lively sounding; Rich, lustrous bass with a rather wide soundstage and nicely done vocals. Can be a bit picky with Jazz and classical, but very well balanced and works great with a variety of sources.
You won't go wrong with the T4 or Mini3.