375 Nodes is into the 3 Universe range, so you'd need the Basic key.
Looks like just under $1500.00 (US) (up to 16 universes) If you think of it as $100 per Universe, it doesn't hurt so much.
The Starter set, at just 1 Universe, is $490 per Universe
The Ultimate version, though it costs $3000.00 (US) works out to under $15 per Universe. Now that is cheap!