The 70-200 f/2.8 has just had a face lift so you should be abe to do a deal very soon on the old model.  The new model is designed to work better on the FX DSLR's at the pro end where as the other is great on the DX (like the D60 is).
As for TC's the 1.7x is the best optically but this means it has a higher price tag than the 1.4 or 2.0.  As mentioned the f-stop of the kit lenses will give problems with the 2x TC and a 55-70 zoom as you loose 2 stops.
				
			 
			
		 
			
				
			
			
				MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
			
			
		 
	
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