In addition to the S1A (which is 16 inches wide and 18.5 ft long), Huki offers the S1X-Special which is their top of the line 17 inch wide ski. I believe that this is the ski that Zsolt uses. Additionally, there is the 19 inch wide S1-R, which is designed for big water.
The great thing about Huki boats is that each boat is custom made for the owner. You can pick cloth layup, colors (including custom paintjobs), various footwell systems, rudders (including overstern), venturis, handles, hatch covers, bungees, etc.
Obviously, for all of this custom work, you do pay extra--but for cost conscious buyers, Huki also sells some standard boats made in China as well as used boats in the "bargins" section of their website.
For me, the big advantage of the Huki boats is that I can buy one boat that I can take on the ocean, but is also sturdy enough to hold up on the river (scrape over rocks, jump over logs, etc.). Huki can make an amazingly tough river layup (4oz Sglass/5 oz Kevlar/foam core/1.7 oz kevlar--plus extra carbon reinforcement) surfski that weighs less than 30 lbs.