The guy who owns Frontier Optics is a guy called Daniel Deringer. Daniel is a friend of mine and lives near me on the Central Coast. He plans to join the forum and our little Central Coast observing group that we are trying to get happening. Tell him that I referred you to him and he will look after you, he is a very obliging helpfull type of person.
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Considering the lx90 has a 2000mm focal length a 10mm eyepiece will give you 200x, which is as much as you can use with average seeing conditions.
A 10mm ortho would be nice for planetary, along with the 25mm plossl assuming reasonable quality should get you started.
Then you can start saving for a 24mm teleview panoptic 
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This was the reason I recommended the 18mm HD ortho as opposed to the 12mm. The 18mm will give him 111x native and 222x barlowed in his scope which are 2 usefull magnifications. The 1st for medium power views of DSO's and the 2nd for planetary. The 12mm HD ortho barlowed would be nigh on useless in that scope giving 333x which he would get to use maybe 10 times a year if he was lucky.
Clear Skies
John Bambury