Save your money, you wil not get a very useful 12000fl out of that gear due to Seeing limitations. In fact powerful EPs on their own regardless of brand, are often useless in normal Seeing conditions. I had a couple of very nice high powered Televue EPs and eventually sold them, as i simply never got to use them.
I would suggest, for now, you stay with good EPs down to 9mm, and you can 2x barlow that if you have really good Seeing. If you want really long focal length in a scope, and its mainly visual, the SCT design can get you there, and they are not hard to collimate.
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