UPDATE
First, thank you to everyone for your valued suggestions. Even though I choose a different direction, your suggestions helped me to learn and make a more informed decision.
What I ended up purchasing (round 1: My experimental choice)
I say experimental because I won't really understand my requirements until I get some experience with the tools I have purchased. I haven't done studio work (and artificial lighting) in nearly 20 years so, I am essentially starting over. To begin, I compromised and purchased one fully automatic p-TTL and two manual slave flash units. I will need more slaves but I will hold off until I fully discover my requirements.
- Pentax AF 360FGZ (used but described as in mint condition) $120
This flash was purchased for every day use... not just for studio work.
Now that I know a little more, I would more likely purchase a Metz p-TTL flash because they offer more 'bang for buck'. The Metz 58 AF-2 seems absolutely fantastic! The slave flash units
The decision to purchase the brand, Yongnuo was based upon the overwhelmingly positive reviews of their products.
- YN560-TX Wireless Flash Controller - $37
Will control up to six flash units over 2.4GHz
- Yongnuo YN560 IV Wireless Flash Speedlite - $143 (for 2 units)
I am very impressed by its features. In addition to the huge number of features, it includes a PC hot sync port and external power connector.
I'll post a follow-up summary of my experience with this equipment in about a month or so.
BTW, I need to make one more purchase... a ring flash (or LED) unit that supports a 77mm OD lens filter thread. Any suggestions are welcome (I'll post a new thread a little later today).