you'd have to get raw sscs 6 mids (which might be avail by themselves now) and then get thier silk tweets. but crystal doesn't think their silks keep up with the sscs (at least for their liking) is why they only offer them as a component with the titaniums.
the tweeters come with 12db hp xovers. it would work to just run the mid up and let it's natural response slope off the upper freq. but you might also consider dropping in a cap on them.
for titanium tweets, they're not bad at all. not what you expect. but everyone has their personal preferance.
at that price point, it's hard to find something competive against it. unless you can score something more upper end for a heck of a deal.
if enough people showed demand, i'm sure doug would put together some sets with the silks. for a company, they're really down to earth and good to deal with. as long as dealer and customer requests are reasonable, realistic, and don't go against the grain if his engineering.
for 07, they should be releasing an sscs 6 version with a stamped basket that has the standard OD (but still keeping the cast basket version). and the sscs 5's should finally be being released also. don't believe some of these clowns with their net sites who say they have them, and been saying that all year.
and their sound stage line is night and day better than thier previous lines. as they were yesteryear, they still are worth what the price is.