I vote for arches as well. My reasoning is that they are probably the easiest thing to "start" a pixel adventure with. They are very versatile, low cost and easy to make and also take ALOT of your incan/LED off your hands to use elsewhere. Typically with two arches, you have the same amount of light bulbs as a 16 strand standard megatree. So if you're replacing more than two arches, you gain power benefits. It also is less frustrating when you have a smaller element have issues your first year using pixels rather than your "main show-stopper". Now, once you have pixels under your belt, you can't but love a megatree that only has one strand per leg that is run by one/two Zeuses or some roof outlines, a mini-mega, some windows, the driveway, the bushes, etc.