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Hi Mark,
If you are only buying 1 of them, my choice would be clearly the 6mm in preference to the 5mm. As Geoff says, the 6mm will see a lot more use than the 5mm. On steady nights you are going to wish you had more power available than the 6mm, so at a later stage you may wish to look at also buying the 5mm. I would definately buy the 6mm before the 5mm.
CS-John B
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