Hi,
codeigniter framework is okay with us but, we would strongly recommend you consider a modern framework like Laravel4 or Yii2. CI / Kohana framework are losing the contest against frameworks like L4 - Yii. Also, you will find that modern frameworks use modern php5 features a lot. and CI last I looked, don't even use autoloading.
git is okay with us, we use that here as well.
For styling, we'll use Twitter bootstrap.
It would be great if you could describe (textually) more about the site:
- Purpose,
- Features,
- User pages/ flow,
...
On hosting, have you considered cloud hosting? digital ocean or amazon?
thank you,
Nirandas