Next week me and a couple OTAPers are heading to Chicago for the auto show (thanks to a kick ass otter). Any tips or suggestions??? Since my girlfriend is not coming I would be stuck carrying the backpack I was thinking of only taking D90 (duh), Tamron 17-50, 35mm, and SB900. Pretty sure the macro 90mm, SB600, and 70-200 will be overkill. However, does anyone see any benefit to those? The only one I possibly could see is the 90mm but the 70-200 would be overkill.