Sorry, my portable battery powered studio rig is a bit of a dogs breakfast to look at, but works fine.
In my experience affordable and studio flash are not two words that go together
I use a Braun EF300 or Norman 200B for the main light, usually into a softbox. Up to a 3x4 box works ok with 160iso film.
Fill light is usually with a Metz 60CT-1 with a mecamat to allow its output to be dialled down and bounced off an umbrella, or the back wall, if it is the right color.
Hair or backgound is usually a Sunpak 522 which also can be manually dialled back.
No modelling light, but exerience and a flash meter gives me good success. Most of these mongrels I have brought back from the dead cleaned up and fed AGM UPS power cells to get lots of flashes at a reasonable price.
Once you try to lift my studio flash rig, you will understand why I also have a 'lite' battery powered rig.
My studio has a well used Speedotron 2400w/s blackline and its 4 heads in a road case that I consider came at a fair price at $1800 , but in my book that is a long way from 'affordable'.