Welcome to our forum.
Caspian would be the equivalent of the Vanguard in the HS line.I prefer the Prodigy over the Sumatran because there are more available jet seats and varieties, but both are great values.
If you want another brand to try (and I'm not a dealer), check out the Artesian line. They have a unit called the Santa Cruz which seats 3 but has 2 pumps supplying 30 jets including a lounger with 3 for the neck, 6 for back, 4 for the legs and 2 sets of foot jets (for different heights). Then 2 more seats both with a pair of calf jets. I think you'll find Artesian to be a little less expensive than the brands previously mentioned and equipped with more jets! Artesian has a good reputation too!