Are you set on a Slingshot? I bought the 100 as my first bag and it is superb. You will very quickly outgrow it, believe me. I have now opted for a Magnum.... http://www.lowepro.com/Products/Shoulder_Bags/allWeather/Magnum_AW.aspx
This means that the 100 is now a very good day bag.
I do have to say that as of this time I still cannot fill the Magnum with kit but hope to do so soon.
Nikonites beware... The Magnum does not take the D200 with 80-200 f2.8, vertically, the way that I would like it.:rules:
David.
I was set on a slingshot, but not so sure now if either the 100 or 200 won't accomodate a D80 and grip comfortably. My bag now is pretty large and holds all my gear, but I really like the design of the SS. Having a bag that I rarely have to put down looks nice. hehe
The SS 300 looks like it would work, but it's still a beast looking bag that would consume my minimal arsenal of lenses. I may just give the 200 a shot and give it to my girlfriend if I don't like it.