All good points. Probably the best argument against the twin is that
Cirrus' singles are so damn fast already. I read recently about a
turbonormalizer STC for the SR22 that boosts the cruise up to 200kts.
Not a cheap mod for an extra 15kt on the top end, but the climb is
probably pretty impressive past 8k feet. I think the next big thing
could be diesels, and a Thielert or SMA might be a nice addition to a
fast airframe.