Lowepro Fastpack anyone?

I'm interested in the lowepro fastpacks and wondered if anyone had experience with them?

I have a D80 with a 17-55, 80-200, 10-20 and Tamron 90 macro plus a flash. I have a mini-trekker for when I travel but would like a bag with easier access when I am shooting for the day. I might not bring all the lens with me each time. I don't have a laptop so it doesn't have to be big enough for that.

Would you recommend one of these bags and if so, which size? I am a small woman so would like the smallest that would do the trick.

Thanks for your help.