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I personally would go for the greater light grasp of the 8" SCT and save my pennies for the purchase an 80mm refractor later.
If you did purchase the 6", and you got really keen on DSO's, then you would be upgrading to an 8" or bigger before you know it. Also, it might be wise to master all the characteristics of a single ‘scope and it’s interaction with your mount, tracking, etc so you can get the best out of it. Having 2 ‘scopes may find you flitting between the 2, and perhaps never quite mastering each one individually?
If you already have e.g. a DSLR with a 200mm lens, then piggybacking it on the 8" would be a great introduction to astrophotography.
Cheers
Dennis
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