The Harbor Freight DA is a great starter especially when you can frequently get it for under $70.
Griot's makes a good entry level and their BOSS DA's are awesome.
If money isn't an object, Flex makes various DAs that are all really good just a little on the expensive side for hobbyists
This was accomplished with a HF DA and Megs 105 before any polish/sealant/wax was applied:
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