The Burton Zoom is pretty small, I'm not sure if it would fit. The Reload is an old Da Kine bag - the Sequence is their camera bag for the last few years. I got this year's Sequence for free. It's an awesome bag and would fit your gear for sure but it's expensive. Lowepro do decent ones too - I used to use a Mini Treker with my GL1.
yea get the LowePro Minitrekker. It fits my vx1000 perfecly, and should fit the 2100. It has a lot of side pockets for extra lenses, lights, filers, and nice padding. I got it for 40 bucks used. but i think you can get it for around 100 new