Just picked up a FiiO headphone amp from Amazon and I must say it was the best 50 bux I ever spent. I also got the optional ipod line-out adapter.
Not only did it make the crappy Giro Tuneups in my Seam helmet louder, but the sound is a lot fuller/richer.
Setups Past & Present
12-13 Jones Carbon Flagship 163W (Current)
11-12 Salomon Burner 163
10-11 Never Summer Premier F1 161
09-10 Never Summer Legacy 156
05-06 Never Summer Heritage 158
03-04 Ride Timeless 159