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hi craig,
i collimate mine with an orion laser collimator deluxe that i bought for 99 bugs at bintel. very user friendly: just centre the secondary until the beam is in the centre spot of the primary and then go to the rear of the tube and adjust the screws until the reflected beam is in the bullseye of the collimator.
i found that the secondary mirror needs alignment only once and the primary every now and then but the scope usually holds collimation.
the orion laser collimator is maintenance free unless you drop on concrete, then its gone.
as for the nebula filter: get an uhc filter, if you can 2". i've got a 1,25" but love the big eyepieces especially for nebulae.
agree with tuc 47, appears somewhat more colourful.
cheers
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