Many of our group use DUAL Inon D2000, but the S2000 seems to be smaller with the same light output.
The 240 has twice the light output. Both stobes need to be the same model or one will cause shadows.
You need two strobes to light both sides of your subject, eliminate shadows, and minimize back scatter.
Adding a Sola photo 600 or 800 as a focusing light really helped in low light conditions.
The built in light on the D2000 is worthless because we never point our strobes directly at the subject to minimize back scatter.
The Solar 1200 or 2000 would be good for video, but you will want at least two.
You need two lights to light both sides of your subject, eliminate shadows, and minimize back scatter.
I even see some people using three. Loclines seems to work well.
No cheap solutions, but the quality of the photos really increased when I spent the money well.