I used Nova 4, Nova 5 and lowepro s&f 400 aw . Nova 4 is great, and Nova 5 is too big to me. Lowepro s&f 400 aw is not comfortable to me although it is expensive. I donnot know why so many ppl appreciate it.
I am using lowepro rezo 190 AW now. The size of rezo 190 AW is silmilar with that of nova 4. To me, rezo 190 AW is better than nova 4.