The DCS578 flexvolt dust collector looks like a nice unit. A few issues, it isn't designed as a vacuum as much as a HEPA dust collector, so no attachments, because it's a HEPA filter it is very expensive compared to a standard vac, like triple the price.
Lastly, it's compatible with T-Stak, not tough system, but that could be it's own thread. Why dewalt has 3 or 4 different, incompatible storage systems, I'll never understand.