Most peeps will tell you to start on a 600cc in-line 4 cyl.  However, I know a few guys who had a lot of dirt experience and they we fine on 750's or even liter bikes.   
 
I would ask what you wanted to do with it.  I have a liter bike and a 600cc.  I enjoy both equally as much.  It's nice to have the brute power of a big engine, but the seemingly endless redline on the 600 is fun in the twisties. 
		
	
		
		
		
		
		
		
			
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				1988 5.0 notch: Previously never modified!!    
SN95 block front and rear seats, Mac catback, BBK off-road H-pipe, Steeda castor camber plates, Steeda lowering springs, Tokico shocks/struts, Alpine/MBQuart/PPI audio mods...
			  
		
		
		
		
		
		
	
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