THE NIKON D40 is one of the BEST d-slr cameras ever made for doing flash + sun light work. Why? Because it can synchronize flash with shutter speeds as high as 1/8000 second. That makes it the perfect small d-slr for the ultimate degree of control over exposures outdoors when flash is being used. The Nikon AS-15 hot shoe mounting PC outlet accessory is nice to have; slide it into the hotshoe of the camera, twist the locking nut, and then PLUG IN a PC cord that connects to a good, powerful flash. if you want a battery-powered flash that can overpower BRIGHT, full daylight summer sun, you need a powerful flash like the discontinued Sunpak 622 Super ($199-$250 new, with some looking for stock), or a Metz handle-mount (amply expensive!). These are flash units that have Guide Numbers that can overpower sunlight at 200 ISO, pretty easily. Your current flash + ambient work looks okay, like you have the basics down pretty well. In terms of actual flash output, a 622 Super (or a top-level Metz) has the actual f/stop output of many 400 watt-second monolights, due to efficiency of the Sunpak's flashtube and reflector and its Fresnel lens in the zoom head. This Sunpak I speak of is well below the price of an Alien Bee monolight, or a Quantum Q-flash AND it has better controls on it than the Q-flash, and is easy to understand, and has a manual, mechanical slide-rule calculator and exposure chart right on the back of it...plus it runs on 4 C-batteries, which TODAY, in the high power ratings of the 21st century, kick some serious ass compared with those whimpy little AA's.