I use something similar called Momentum! Gives that nice looking dashboard esque new tab screen.
Also I took a chance and bought the Surface Pro 3! I found an offer on eBay, where someone was selling theirs with the pen, and the surface 4 version keyboard cover, along with a second charger; and the Surface was the i5, 4gb, 128gb version that I had been looking at, all for less than $400!
That's a great deal! Congrats!