But, since this contest for me has been about letting go, I'd say my final answer is Housing Works. Not necessarily for what you can get there, but for what donating items there has allowed me to accomplish. And it couldn't be for a better cause.
What is your secret?
My favorite school assignment was "compare and contrast," a philosophy that works when pulling together a space. Items and furnishings should intentionally relate to or contrast with others, whether through shape, texture, color, etc.
Also… Buy what you LOVE, and don't feel compelled to do it all at once. The result is a space that reflects you, but doesn't look like it came out of one box… Determine what you need to store before you buy the solution… Don't overlook ANY potential source: interesting stuff can come from off-the-shelf places… Paring down makes you appreciate more what remains… HAVE FUN. Patrick