If you want portable yet reasonably powerful, take a look at the Calumet Travelites - they're made by Bowens, so they take all of the gazillions of Bowens accessories. They've got 750 w/s versions that you can pick up used for not much. I've had my set for well over a decade (probably 14 years now, maybe 15) and they're still working just fine. Granted, I don't stress them out. You can get f22 at ISO 100 out of them in a softbox, but you'll have to get the softbox pretty close. I used them for shooting 4x5 portraits often and they worked great for that. I've since upgraded to a set of Calumet Elite 2400 w/s packs and heads because I'm shooting bigger format stuff a lot (anything from whole plate to 14x17). With 750 w/s, you can also double them up into a single umbrella/softbox and just slave the second one (they have built-in optical slaves) to get you that extra stop of output.
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