Replying to Camera bag help

Okay, so i've gone through a bunch of different ways to try and carry my camera and haven't fount a nice solution for me, yet.

Right now I have a Medium Fstop Pro ICU, which i stick into either my osprey or dakine pack depending on what i'm doing, and a small lowepro toploader that i've rigged as a chest pack (holds body w/o grip and the tamron)
The ICU holds most of my gear, but it's starting to get pretty tight in there.


My current camera setup is:
T2i w/ grip
tamron 17-50
canon 70-200 f4
helios 58mm
yongnuo 560 flash
vivitar 285 hv
Set of flash triggers
extra batteries for camera and flashes
filters
random odds and ends, lcdvf, memory card wallet, etc.



I think what I want is to get rid of the Med. ICU, get one pack that can fit ALL of my gear. This would be a photo ONLY backpack. I'll probably be getting more gear in the future, too
In addition to the backpack, i'd get a small ICU to put in my backpacking, or backcountry skiing bag when i go on trips.

I'm looking for suggestions on the backpack. My budget is around $150.
Thanks

inb4 fstop. would fstop be good as a photo only bag? or are there better ones out there?