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For primarily visual observing you would be nuts to go with a 4" refractor. I have 3 so it's not like I don't appreciate them. However, an average 8" dob will show you much more, and for your budget you could probably find a used dob up to 16". The whole argument around light pollution or poor seeing being worse in a big scope does not match my experience either.
Many of my friends here use the CPC9.25" or similar and I am always impressed with the versatility and convenience of these. I'm pretty sure 5k would get you something like that.
Cheers, and remember, advice is worth what you pay for it :-)
Andrew.
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