Short answer is, it depends on what you want. What's the goal of this built?
1500$ won't get you really far, especially if you spend only 400$ on groupset AND all components. The components (excluding wheels) are usually equivalent to or more expensive than the frame itself.
I don't want to burst your bubble, but at that budget (and since money seems to be part of the equation) you should probably just buy a complete one full price or on sale. You'd get 2-3 times more ''bang for the buck''.