I don't think HSU makes subs that are DSP controlled like the EP400, 500, 600, or 800. The ULS-15 is a sealed design like the EP800. The 400-600 are ported design. There are pros and cons to each.

Based on your budget though, I don't see a ULS-15, EP600, or EP800 in your future, unless you save. The EP350 was recently updated with a new 300 watt amp, and has great reviews. The EP500 is DSP controlled with a 500 watt amp.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85