Brian,
I think the experiences of both shmne and Steve Reddin are very 'illuminating' (pardon the obvious pun). Two different people,with two different approaches. I happen to agree with both of them! Both make good points. Shmne mentions using ambient lighting as fill-in light, while Steve has a studio that he can kill all ambient light in, so, different working methods, different approaches, different results.
Over the last few years, the Strobist web blog has garnered a huge following, of people who use mostly speedlight flashes, but also what the blog's author David Hobby refers to as "big lights", such as studio monolights like Alien Bees, White Lightning, or DynaLite, or Profoto studio flash systems. There are other choices on the market too. One that looks intriguing is the
Adorama FlashPoint 320A monolight, priced at $129 with a light stand and an umbrella, with free shipping. I am of the more-is-better school of thought,and tend to agree that three lights is where you want to begin...three separate light heads, and at least one large reflector, like a 42x78 inch white reflector with some type of system to hold it in position (two clamps,for example, or leg braces and a boom arms+ clamp system,etc).
My feeling is this: modeling lights will help you learn better,and faster than shooting blind with speedlights. The Strobist way is, I think, better for people who already have pretty extensive experience in lighting using studio lighting gear. From what I have seen, beginners to lighting learn better when their lights have modeling lamps in them, because they can visually SEE what the light is doing,as the lights are moved around and positioned...which is a huge asset when setting the main and fill lights, as well as the hair and background lights. When you want to use three or four or five lights, a constant visual preview is very valuable; with studio flash units, there is that visual preview from the modeling lamps in each light head. I'm not bashing the Strobist ideals, but merely pointing out that studio flash vs speedlights have this one area of difference.
With the
Adorama FlashPoint 320 being such a low-cost flash, it is around 4x less expensive than a single Canon 580 EX-II or Nikon SB 900 speedlight....so, buying 4 or 5 of them would be within normal set-up costs of just two camera-maker flash units.