You do not need a progressive press.  You could pick up a new or used three die set (I see a set of RCBS 45 acp on Gunbroker for $16) to use in your old Rock Chucker to see if it suits your needs. If you think you may later get a progressive, pick up a nice set of carbide dies that can also be used in your progressive.  
I have been using a Dillon 550b for 20 years and find it handy for semi-auto ammunition where I can load up a bunch for a fun day at the range; a person can really crank out rounds pretty quickly. 
Good luck, 
Dennis
		 
		
		
		
		
		
		
			
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USAF (Ret) 
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