I have a pair of Quest 4D GTX that I actually love for the majority of the year. However I find them too hot for the summer months and my feet sometimes get uncomfortable sweaty, to the point that late spring through mid fall they stay in the closet.
I've been considering getting a pair of non GTX Lowa Zephyrs for the summer months, but my friends keep talking me out it.
Will I regret not having GoreTex in the summer? I don't spend much time (if any) in the summer slogging through bogs and streams. My gut tells me that I'll wear a boot like those more (or exclusively) over the summer instead of my Merrell Chameleons, that don't provide a whole lot of breath-ability or backwoods support as is.