I've had my 8" Dob for about 3 and half years now and have come nowhere close to exhausting the possibilities of the scope. So I endorse the earlier comments. Use your 8" for longer and tease out its capabilities. Even on objects you revisit many times there is always more to see/find and learn about.
I have though, just decided to add a modest ED refractor to my scope stable - for two main reasons, 1. for use as a terrestrial camera lens, 2. to exploit short sessions (cloud, cold, time) that would not be available to a cooling 8" (which took nearly an hour to reach stable temp last night).
I have also begun to chase less glamorous objects such as carbon stars, doubles and open clusters. In fact I spent about 2 hours last night between Orion and Monoceros doing just that and thoroughly enjoying the viewing.
Cheers.
Darren.
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