...and the advice. I looked at the new Sigma EF 530 DG Super and the 500 Super, and then saw someone's test photos from a KM3600 (Sony 36), KM 5600 (Sony 56), Sigma 500 Super, and a Metz 54:
http://photoclubalpha.com/2007/06/12/flash-choices-for-the-alpha-dslrs/
I didn't want the trouble of figuring out how to mess with the exposure vs. flash power of the Sigma 500, and didn't know if they fixed it with the 530 (no reviews that I could find) and so went with the Sony 56. Several people said to buy the Metz 54 because it gets rid of lazy eye results the other flashes seem to have and because it's such a "great" flash that "you'll be able to use on other cameras if you switch" (like I can just throw $1K+ around on a nice camera and accessories at the drop of a hat); however, the instructions are less than impressive, and it doesn't do HSS off camera (plus it's nearly another $100, even before you find out whether it comes with the shoe adapter for the Sony, which might cost another $100 if you have to order it--it wasn't really clear, and Metz seems to be selling to Nikon and Canon owners anyways--they still refer to their Metz flashes being "for the Minolta").
Nobody ever answered where they were all made, so I'll post that when we receive it. Hope this helps some other photog alpha100 a100 alpha newbie. I'll throw in some more phrases to make this thread come up on your search (I hate searching message forums, the search function always bites, and then some wiseacre always says "Did you even search?"): Sony HVL-F56AM , Sony HVL-F36AM , Sigma EF-500 DG ST, Sigma EF-500 DG Super, Metz Mecablitz 54MZ-4i, Metz SCA 3302 M7 (shoe adapter).
We're looking forward to some nice portraits and landscapes; so far the pictures we've taken are definitely classified under L for learning.
We'll eventually banish the nakedness of our home's walls forever! Cheers!
p.s. Moderator, if search is giving disboards trouble, do what dpreview.com does: limit search to once every 20 seconds! It wasn't too annoying, and probably keeps their servers from getting swamped.