Camera bag for V1 kit

I'm trying to decide on a small camera bag for my V1 kit that I just got for Christmas.  Unfortunately, no Best Buys locally where I could go out and buy from them and see exactly what I was getting.  I've got the V1 with the 30-110, and may get the flash unit someday, and possibly the 18.5.  I want a bag as compact as possible.  I've been looking at the Lowepro Rezo 110 on-line.  Would this bag be large enough for the kit?  Would it make sense to get the Rezo 120 in the event I should also get the 18.5mm lens someday or could the Rezo 110 store both extra lenses plus the flash?  I've also noticed the Adventura 120, but I like the fact that the Rezo line has a belt loop.