All the hid kits are the same. They'll all give 'blurry' light. The 6000K globes are more of a blue light and the 4300K is supposed to be the colour of sun light. If I were to get an hid kit again, I would go for the 4300k. I wanted a blue to my light, but I found 6000K too much.
If I were to upgrade to better lights in the future, I would definately go retrofitting. I kind of regret buying my hid kit. It's an improvement, but.... it's up to you.