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I've been looking at 8" and 10" models thinking this will be enough to satisfy me but I'm the curious type and I can see this like all my other hobbies getting quickly out of hand.
If you want something relatively large but don't want to spend a huge amount of money you might want to look at one of the amateur astronomer's best friends, a Dobsonian reflector. You can get a large aperture Dobsonian with excellent optics for a few hundred dollars. They have very simple mounts and they're easy to use. I get the sense you don't mind a more rustic sort of scope, instead of the more polished goto designs. On the other hand, if you anticipate your interest dying out in the near future, you might not want to get a big light bucket but rather something more manageable--a more "I'll use it once in a while" sort of scope.