I had some Infinity Kappa one's and they were very good, they came with a proper crossover box which is better than the crossover in the wire sh!te.
When amped they were crystal clear but not that bassy, but then I had the Infinity Kappa sub to do the bass work.
What other sounds you got in the car at the minute as this will determine what is best for you and what you want out of the sounds.
I currently have CDT's upfront which are absolutely awesome an crystal clear with great mid aswell, i'm not sure where to go from here though, so gonna keep an eye on this thread and may get some 6"9's