Throw in my $.02.
While I (foolishly) sold mine a while back I recommend Sharpstar/Astrotech/TS 105 f6.5.
Large enough to make a difference over an 80 or 90mm, but still remains easily portable.
The copy I had was amazing - crisp, clear with pinpoint stars to the edge and held high magnification (150x) like a champ. The only other 4" scope that I have enjoyed as much was an SV105 with the LOMO lens costing more than twice as much.
You can find them "pre-loved" on the interweb for quite reasonable prices and I think the NIB items are only around $2K.
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