First off a D300s would be better as it has the newer image processing to the D300.  I very much doubt there would be a D300 except well inside the second hand market.
All your lenses will work fine, in fact they would all work fine on a D700 or D3s/x.  The Tamron and Tokina are DX lenses so on any DX camera they are a perfect match on an FX camera (D700, D3s/x) they will crop to the DX sensor size.
The SB800 is a no brainer and works a treat, the D300(s) has improved CLS functionality over the D80 so you have a little better off camera control with multiple speedlights.
Rumour is of a D90 replacement very soon too.
PM CowsGoMoo he has a D300
				
			 
			
		 
			
				
			
			
				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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