Hi Tardis,
to I.I.S
I agree with all that Les spoke about, but I would like to add that an 8" aperture is not small!!
It will still give you excellent views of any of the planets, it's just that the 16" will be a whole lot better!!
Your current scope already has tracking capability, this is a big bonus if you're into sketching your image.
With the dob you will have to nudge it along to keep the image in play.
A tracking platform will help with this.
Whether you stick with your current scope or go to the larger aperture, the images will be very good.
