I am a hobbyist/newbie -- I mainly just shoot family events, my car, and car shows for giggles. My mum purchased me a D90 for Christmas that I got last month with a Tamron 18-200 and Tamron Wide Angle lens; it was second-hand from a friend of hers--I'm not complaining, it's a nice cameraToday my 18-200 lens fell out of my backpack and broke; not really happy about that. So, I'm in search of a new lens and came across these two--was curious what you recommend? I've read some reviews--the cost point for both lenses is a non-issue; I don't mind spending that kind of money on the right lens. I'd like to practice and get better at shooting; I attend a lot of automobile things and it would be nice to capture some great shots.These are the two I'm looking at;Nikon AF-S DX NIKKOR 18-200mm f/3.5-5.6G ED VR II ZoomTamron 18-270MM F/3.5-6.3 Di II VC PZDThanks for any recommendations you might have.