I had the X-18's for a season and half, before I went to the Ping I5's.
They both hit the same for me, as far as distance. My SS is just about where you are, but with the X-18's I had a slight fade and with the I5's; I was able to shape my shots a lot better at will.
And one thing I noticed that if I swung poorly and caught the X-18's on the toe, the vibrations would travel up the shafts and definitely let me know how poorly I swung. When I hit slightly on the toe with the I5's, it doesn't punish my hands and my shot didn't veer too far off the mark, while still letting me know that I caught the toe.
After a while, the Callaways just looked too bulky at address, and I couldn't shape it as easily as I could with the Pings. So, my vote would be for the I5's. I still have them as my backup set, even though I've also picked up some I10'sds.
On a side note, my buddy has the X-20's, and while they still look bulky, I think they hit better than the X-18's. So you might want to give them a look, if you go with the Cally's.
Edited by ChiGolf, 11 October 2007 - 01:20 AM.