Very nice capture!
I don't think the background is too busy! you can't get much less busy, really.
Looks like the 50mm 1.8 is working well for ya!
5D MK III, 50D, ELAN 7E, 17-40mm 4, Sigma 10mm 2.8 fisheye, 18-55mm 3.5-5.6 IS, 30mm 1.4, 85mm 1.8, 580 EX, 430 EX speedlight, Pocket wizard flex and mini.
Pentax P30, 50mm 2.0