RJ,
I'll base my response on dollars. About $2000 worth of NODES, plus the additional amounts for dongles, hubs, controllers to complete things.
So, if if node price is as low as .50 / node I'm in for about 4,000 nodes. If on the other hand node price is as high as .75 per node, then I can only afford 2,666 nodes.
I'm very interested in node types other than the basic "RGB LED on a string" that you have shown us. CCR type strips, spots, floods, wall washes, etc are of great interest, but those type lights may (will, I'm sure) have a different per node price point than the basic smart strings.