First, if a 414ce fits you from a tonal perspective, I'm of the opinion that you should go that route, assuming that's all you're concerned about: Tone.
If you want something that someone can't simply pull off the wall at GC, then the BTO route is the way to go. You'd be surprised at how unique you can make your guitar by including some no cost or low cost options. You'd have a unique guitar, in the tonewood you like (and Ovangkol is a no-cost option on BTO), and it'll be just a few dollars more than a standard 414ce.
As for the Ovangkol set which would actually be used, my experience has always been that a BTO with Ovangkol is going to be built with a higher grade of wood than a production 400 Series guitar. This, in no way, means that will happen if you order an Ovangkol BTO. It depends on what wood sets they have ready to go at the time. I've seen some pretty striking Ovangkol used on BTO's, though, and I would be confident that I would get some nice grain/figuring.
Also, if you do opt for a BTO, don't use one of the BTO sheets that someone on any internet forum would be able to send you. The BTO worksheets change regularly, and there's no way someone on a forum can guarantee that they're sending you the most up to date version. The only exception to that is if the person on the forum happens to be an authorized Taylor dealer.
Hope that helps...