I have a lot of Speedotron gear, both Brown Line and Black Line, and have been an owner of Brown Line since 1986, and Black Line since 2001. Pack and head systems are a different animal than monolights, and have several advantages, and some disadvantages as well. A Brown Line kit from
eBay with the D402 power supply and three or four light units would cost perhaps as low as $250, to perhaps $325, depending on a few factors, so that would be FOUR light units and the power pack (AKA the flash generator), bringing each light cost down to well under $100 per unit. But no, it is not as flexible as a monolight.
Here is the GODOX official page in English:
GODOX PHOTO EQUIPMENT CO.,LTD Products
Their GS or Gemini series looks pretty good:
GODOX PHOTO EQUIPMENT CO.,LTD GEMINI GS Series Flash
The QS series has BUILT_IN wireless triggering, wireless modeling lamp adjustment, and wireless power output adjustment capability--all of which would be nice.
But, HONESTLY...I think that something lower-cost than Alien Bees is the best starting kit. I've suggested Flashpoint 320M monolights from
Adorama for the last almost 10 years, due to cost. The 320M puts out MORE light than an Alien Bee 800 does (the numbers that most makers use are greatly inflated...the 320M is like 150 Watt-seconds, the Alien Bee 800 is a little less than that in terms of measured output). And honestly, I think 400 Watt-second monolights are a poor choice for many users: too MUCH power!!! 400 Watt-seconds is too much power for many uses, and it's nice to have some lower-powered light units to ratio, as fill, background, and accent lights, against your Main light...
BUDGET? How many lights? Etc,etc..
I say go for 3, or 4 $99 to $129 monolights from
Adorama or
eBay...and do NOT spend much money on your first set of monolights!