Callaway X-18s beat the Nike CCi irons in every category, with the fact that Nike still really isn't a reliable golf equipment brand. Some of there old SQ drivers were not USGA approved by the way. Check the official 2008 Golf Digest Hot List for more ratings for all major club brands. This website is a must before buying any clubs at all.

ITS NOT THE CLUBS ITS THE PLAYER… LOL

i do not think either one of these will help, shooting what you do i would go with one of the game improvement irons like the callaway big berthas, they are very forgiving, off center hits don't really loose distance and the wide sole will help you get the ball up inthe air.

if you are getting them new, look up online professional clubfitters society and go get fitted bysomeone from there, they will generally do a better job at fitting you than your local proshop, the price is the same whether they are custom or off the shelf if you order them from callaway.

getting properly fit is more important than the type of clubs by far, shaft, length, lie will influence your swing, next get some lessons

Well I would go with the callaway's but neither of them are game improving irons so it doesn't matter.
If you really want to get the best iron to get rid of that slice i would go with the taylormade r7 cgb max they really get the ball in the air in a hurry but if you want workability i would go with either of the irons you picked