It's really not hard to build an excellent light yourself. Get one of the outdoor halogen fixtures, put a 12 degree spot bulb in it. Add a little loctite and silicone sealant to vibration-proof it. Mount it on your bars using a conduit hanger, and wire it to your choice of battery pack. Cost of materials should run under $80 if you stick to SLA batteries. More exotic batteries cost a bit more. Fore more info, check this thread.