If its good optically I'd keep it.
Even if you are yearning for something different now, you will probably regret parting with this:
(a) the optics are not just good, they are excellent,
(b) it's a convenient size for throwing in the car for some casual visual observing when it suits you,
(c) at f/3.9 or f/12 it's ideal for widefield or planetary.
To do significantly better you'll have to go for a short 14" dob (visual use) PLUS a larger SCT such as the 16" Meade ACF or RCX - a 10 or 12" is not that much bigger than what you have to matter. If portability is an issue then you're in for a shock lifting a 12" SCT.
The other downside is that its not exactly a "grab & go" scope. If that is what you really want to do, plus some widefield photography, then a 100 mm refractor in the range f/6-f/7 seems to be the go.
But you will regret parting with this.
If you still want to sell let me know in a month or two, I'd be interested.
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