Hi Graham,
Congrats on the purchase
. The telrad is great and makes finding things that much easier.
Think carefully about getting the 6mm. Conditions have to be very good to get the most out of it when you get to that magnification. Something in the order of a 8-10mm might be better way to go.
Also, as many say, its better to have a few good quality eyepieces as opposed to several average ones.
Clear skies Norm
