G'Day Mystikal,
The CG-5 should handle scopes up to about 8" - 9.25" in diameter. Celestron packages it with both their 8" Schmit Cassegrains and Newtonians. In fact I think they sell it with the C9.25 as well. So it should handle any smaller scopes as well.
If you main interest is planetary stuff, then the CG-5 will do the job fine. Your biggest dilemma will be what scope to put on it. I am very happy with my C8, the are a lot of people with C9.25s that do some excellent planetary work with those. I would consider both these scopes quite portable (but I would remove the OTA at least to transport!)
Al.
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