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John, I'm quite surprised that you can't see Saturn's rings through a 10" dob. This makes me wonder about the collimation of the scope. If it's not well collimated you would lose a lot of detail. How does it stack up if you do a star test (ie point it at a bright star, put it out of focus until you see some concentric rings around the star - they should be circular and not skewed to one side)? Forgive me if I'm telling something that you already know. At present Saturn's rings are edge on to us and you won't see detail, but when they are tilted, you should see at least one division. On Jupiter (later in the year), you should be able to make out cloud bands, the great red spot, moon and shadow transits.
I would also imagine that if you're near Penrith, you are not really getting dark skies. I would echo Eric's suggestion of getting to a star night at a dark sky location and seeing what is possible. It might also help to get someone to check your scope in case something is wrong.
Again forgive me if I'm telling you things that you're already aware of. You will see some colour on Jupiter and Mars, but not on deep sky objects as you will still be relying on scotopic (night) vision, which is always monochrome. But you should still get quite a bit of detail on nebulae, GCs etc. With patience and a dark sky, brighter galaxies should also show some detail. You should also get some very nice views of open clusters with a 10" dob, including some nice red stars.
I would also agree with Jason about magnification - 100-150x is a reasonable expectation for most seeing conditions. With your 6mm ep, your will usually get only a mirage unless seeing is exceptional and as you have found, a good view of floaters and blood vessels in your eye.
Then again, as has been pointed out, some people just don't get excited by what you can see through a telescope. I do hope that you can find some joy with yours.
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