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...for my current lights, I use 2 speedlights, lastolite ezybox and the second as fill.
Your shots on your Web page look very good to me; better than many people can get with monolight strobes, let alone Speedlights.
Since you already have and are familiar with Speedlighting, the lowest-cost option I can suggest is the 20-inch RPS Studio BeautiDish (note the spelling). It's specifically designed to work with Speedlights, and includes the dish, two deflectors (one opaque silver and one transluscent white), and a diffusion sock for just under US$140.00.
I've been using mine for a little over a year now, and really like the quality of light I get from it. I also bought the optional 30-degree grid, but haven't used it much. (I use the grid on my 11-inch BeautiDish all the time, as a hairlight or accent light.)
Here are a couple of views of my RPS BD: