DSLR bag, 2-3 lenses and flash?

I can't find or make up my mind. I currently have the Nikon D3100 with Tamron 18-270 PZD VC lens and a Metz 50 flash. In the next two weeks I'm going to buy the Nikkor 35mm f/1.8 and I can't fit all those in my current Sony camcorder bag, which can just fit my current gear. So I'm looking for a DSLR bag for a body and lens + max 2 other lens + flash. Just recommend me something, low price would be appreciated.

I have a Think Tank Speed Freak and it is the most versatile bag I have ever owned. Think Tank is not the cheapest, but they are the best.

http://www.thinktankphoto.com/products/speed-freak-v2.aspx

This is my bag - very nice. I carry two dslr cameras, lenses, batteries, chargers and lots of other stuff.
http://tamrac.com/5606.htm