OSX still doesn't have cut & paste for files, which is utterly ridiculous IMO. Keyboard support for Finder is all-round lacking.
Copy, then hold down the Option key while pasting, by keyboard or menu. In the Edit menu, "Paste Item" will change to "Move Item Here".
Even though it's not as discoverable as it should be, this is a well-reasoned UI move on Apple's part. Even on Windows, cut & paste has different semantics for files than for text, and this solution sidesteps the weird "cut-in-progress" mode and inability to paste again.
If the folder you're moving to isn't readily available just Cmd+N to open a new window, etc.