What would be a good upgrade for the D60? I LOVE my D60 since it's super lightweight and easy to carry but I have a couple of issues with it. 1. my biggest problem is the 3 point auto focus! 3 points is really very very little so many of my images need a lot of cropping since I can't get the subject in the exact same position I like and use the AF. 2. After about ISO 800 it gets terribly grainy. Also I would like maybe ISO 3200 or 6400 as the max. 3. no live view or video. I was looking at a D5000 since it uses a CMOS sensor yet has a similar sized body as a D60. Not sure if I should go for a D90. I just find it too big and heavy since I'm a girl and usually when I go take photos I'm holding a dog leash + a bunch of dog stuff. Would a D90 be a better deal?