Those ebay ones are fine, but... they have a rather irritating three mode system, one of which is flashing! You can modify the circuit board so they act just like straight forward spotlights...

http://www.xt660.com/showthread.php?t=24741

There's loads of choice on ebay these days, and they're all pretty good. There is no need now to spend a small fortune on Vision-X LED spots from the US (which is what I did seven years ago). Keep searching on ebay for an alternative if you don't fancy modifying the internals!

As for the power consumption, you'll be fine running what you've got with the lights without modification. Just make sure each accessory has it's own inline fuse for protection.

Worth reading the thread below regarding the charging system capacity on the XTs...

http://www.xt660.com/showthread.php?t=18294

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