Shrug. Well I listened to your advice and as already stated, since 300cm or longer were not available (without ordering for the US maybe), whereas the 280cm once actually was I've gone for that. Following the recommendation of several avalanche professionals is good enough for me.
I'm glad at 320cm yours all "go up to 11" so to speak but the crucial thing is that I now have something that I can and will carry with me in the side country where I will be using it instead of nothing. So let's just move on and hope none of us ever need to use them for real.