After reading some comments about my first video I made I am now looking at getting a wide angle lens so I can get better action shots.

I have a Sony DCR-SR30 30Gb HDD camcorder, can anyone recommend a good retailer and recommend a good wide angle lens.
The lens on the camcorder is 30mm.

I have also been told a polariser lens could be a good idea if I am filming on bright days but again I need recommendations.