I think that the Taylor is your best bet, and I have played them all here at the dealer's but won't buy one, because I like traditional Martin, and can get a barely used one from the Taylor dealer when I can afford it.
You might be voicing a guitar to the volume of other instruments in Celtic music, just as I am voicing a guitar to my loud raspy voice now or in the near future. Or you might want really bright stand-alone sounds.
So, I recommend the Taylor. It really is open and airy, bright and sweet, due to it's requisite spruce top, and the full dreadnought body. So... those weren't just words that they used to sell you.
I have been served well by Seagull Model 6's and Normans for nearly 20 years, and have researched their Canadian builder and his factories, and intend to keep my 1992 Model 6 as a beater.
My main guitars, not that it matters, but for your info, and as a reference are a Garrison, and also a Tacoma which is a real cannon, but in both, I hear cedar. Because they are
I bought a brand new Norman B15 this summer, because I needed spruce again. It would do, until the Martin became available, for show? B15 is very good though, while Seagull sounds are muted in comparison, cedar is kind of midrangey or a little bit dark. Mr. Godin cut down the size of their upper bout because they were boomy, and wanted crisper, tighter upper register definition, but it doesn't quite make it. Therefore I would never see Seagull as a fingerpicking guitar, or for lively ethnic music.
The Epi Masterbuilt is another that I am familiar with, and have read good reviews. But even at its best, and with the bell shape, if it were a Gibson, it doesn't do loud music well. Gibsons are sweeter and softer too, think: James Taylor sound (no Taylor pun intended) whereas Norman (IMO) and certainly Martin are Neil Young, loud