Hi,
My recommendation is a little late...and a little old, but I believe that it may still be valid if you get the newer models (late manufacturer).
Simply, the
VIVITAR 285HV units.
Very capable workhorses. Very powerful for a hot-shoe mounted unit. Very accurate auto control. Neutral colour balance. Very versatile with manual control down to 1/64 (hey, it was designed in the late 870s or early 80s remember?).
Now, all those 'verys' are justified I feel because a brand new unit shuld cost less than S$180. 2nd hand ones in good condition are usually rock-bottom priced! Some owners who have the 285s still report that they work well even after 20 or 25 years!
For reviews and a picture of the flash, go
http://www.stormlabs.com/Cameras/All/Product/493764/id/4498
Downside? No swivel. No TTL. Older technology. Some may consider it a bit big (but then, it's very 'MACHO' and 'PRO' looking!!!). Look into the customer reviews in the link above.
I believe that in the 80s, it was one of the workhorses of photojournalists and other profressionals who got tired of lugging their Metz hammeheads and battery packs around, if that tells you how reliable and capable it is.
The first 285hv I got, and literally abused regularly lasted me more than 10 years. Then in early 2000s, I got another one (only because I physically destroyed my then working 1st piece by trying to take it apart in ways that a moulded plastic contraption shouldn't - by force) and it was in perfect working condition this year when I traded it for something else.
Bottom line? If swivel flash isn't really crucial to you, and you want a very powerful unit that's very accurate, very durable and has been proven over and over again, and at a non-professional price, look no further than the 285HV! You might find one or two pieces arounf People's Park n some ulu corner or unexpected store. Just ask around. Or check out B&H and online resources.
If it were at all compatible on DSLRs, I'll be using it all over again.
Happy Shooting!