Congrats, the 216LS is a great boat.
Get the 5500i (internal antenna). The internal antenna works fine on the lake, it's what I had all summer and will install in my new boat in the spring. Makes the wiring a piece of cake once you figure out how and where to mount it. Where I mounted mine last year, I obscured a few of the gauges a little when I was fully seated, but since I drive on the flip up bolster looking over the windshield most of the time, it wasn't a problem... Take that into consideration...
What other options did you end up getting? What color? I love to hear about boats, got any pics???
More reasons to look forward to next summer.
And Dave R is a great tour guide, plus his boat breaks the chop pretty well leading to a smooth ride while following