I'd get a hold of a 4" refractor first and try it out under some skies before makign a decision.
I had a very nice Lomo triplet 4" scope that gave views every bit as nice as a 4" Tak, pin sharp, great views etc. but even under the darkest skies it didn't float my boat after a while. I had a little C8 at the same time, and I tended to take it with me more often after a while. Great planetary and moon views, the extra magnification and light gathering won me over most nights, and it was extremely portable.
Whereabouts do you live? It will probably be quite possible to borrow or at least get a look through various scopes under darker skies before you buy. I'd strongly recommend doing so before plonking down the money.
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