Help! I have an almost brand new XSI w/ 2 lenses (18-55 and 55-250) and love it (purchased in May of this year). I was going to buy a vertical grip for it as well as the new Canon 18-200mm IS lens or the new Tamron 18-270mm IS lens for convenience.
For the money that I'll spend on these items, is it worth selling my XSI and upgrading instead to the 50D that comes with the 18-200mm IS lens? I'm not a professional but love to use my camera and don't want to get trapped into 'newer is better'. Any advice would be GREATLY appreciated!

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