“is it only the aluminum models that will be at 78 degrees.”
yes. they changed the geometries they could change for 2007. that means the kilo/tequilo, and of course you can get your tiphoon however you want. same thing with giant. the trinity alliance is 78 degrees, but the trinity I & II remain at 75 degrees because these molds are already done and can’t be changed. they must be used until the model runs its lifespan.
felt is the only company i can think of that just up and ditched their entire geometries, top to bottom, in favor of the new 78.5 stuff, with longer front/centers, etc. but it was easy for them because they didn’t have any carbon bikes before. (note: trek also ditched all their geometries, but the 9.5 and 9.9 aren’t quite as steep as those on the felts.)
as for the lucero, caliente, etc., depending on how you ride it might or might not be your optimal bike. faris, normann, torbjorn, all ride their cannondale, kuota, and argon18 (respectively) steeper than the bike is designed. they do fine. what QR does offer is a way to get steeper. i remember when jonas brought his argon18 mercury to the compound last year, it was a bear trying to get that thing steep enough for him, because he is a big guy and the bike is a 76 degree bike and we just played hell getting it to 81 degrees (where he rides). not so the QR, which can be gotten as steep as you want.
the question is, when you get it that steep is it long enough, since you’ve effectively shortened the bike by getting it steep? yes, i understand your “seat shifter” analogy, but how is that different than cervelo’s forward seat post hole? what matters is what’s underneath you once the bike is positioned for you up top. where are the wheels? how long is the stem, that is, how long is that steering lever placing the bars in front of your steering axis (the steer column)? it’s about weight displacement, and it’s about how much weight is cantilevered in front of the steering axis. if your lucero solves these problems it will work for you, just like normann’s kuota works for him. having said that, i would imagine normann will switch to kuota’s new frame, which is supposed to be out early next year, and is at 78 degrees.