There is no ghosting with an IPac. The IPac was created to eliminate the problems that occured with keyboard hacks.
Keep the 8-way, they work perfectly with the IPac. When you move the stick to a diagonal, both switches are pressed, and both keystrokes are pressed at the same time. In theory, you could activate all 28 inputs on the IPac simultaneously, and the PC would see that all 28 keys were pressed at the same time.
Get the IPac.