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					Originally Posted by Ant  However, one choice  would be to get the 18-200 and if you eventually need extra reach you could always buy a tele-converter | 
	
 As Stephen Fox has pointed out in another thread elsewhere recently, tele-converters should only really be used with very, very good quality lenses.  I know that if I use my t/con with my cheap Sigma 135-400 I get awful results.  The two Tamron superzooms that Trinity is considering are very much convenience, consumer lenses (as Robski has already pointed out).  I certainly wouldn't consider using a t/con with either of these lenses.  If you need more reach later, there's plenty of 75-300 models that would do better than an 18-200 with a t/con attached.
Just my two penneth.