Looking for the right camera bag?

I have been searching through tons of camera bags and I need a bit of help trying to find the right one. I have a few bags that carry just about all of my equipment and now I'm looking for a small bag to take a few things. Here is a list of what I would like the bag to carry: Nikon D300 w/ Battery Grip 17-55 2.8 attached, Nikon 50mm 1.8, Tokina 10-17mm Fisheye, SB-600. I want a bag that gives me quick access to my camera but is not on the bigger and bulky side. Also, I would prefer a sling or shoulder type bag over a backpack. Any suggestions are greatly appreciated especially if you have experience with certain bags.

I believe my dad uses this bag for his camera
http://www.bhphotovideo.com/...s_Bag.html

it says F2, but I'm not entirely sure it is. Anyway, the bag he has fits his Nikon D300 with the 18-200mm lens attatched, a tokina 11-16mm, 35mm nikkor f/1.8, and a nikkor 105mm macro along with the SB800 flash, cleaning supplies, lens covers, filters, memory cards, and with some room to spare.

The quality is excellent.

You can consider Nikon 5874 Deluxe Digital SLR Camera Case

Interior Dimensions: 10.5"L x 5.25"W x 6.5"H Exterior Dimensions: 11.5"L x 7.5"W x 7.5"H
Holds & Protects Your 35mm or Digital SLR Camera With small Zoom Lens Attached, Plus up to 2 Extra Lenses or Flash, and gadgets
Adjustable Padded Dividers for Slight Customization, plus 1 inside Pocket under top flap, and 3 outside pockets 2 on the sides (Velcro) and one under the flap (zipper)
Constructed of Durable Wear-Resistant Nylon
Nikon 5 Year USA Warranty