After some reading , i have settled with QuickOffice Pro HD ($20 in appstore) The reasons are simple
1. It works with standard office formats natively (no importing or exporting nonsense). If you are remotely in a microsoft environment outside of your ipad then iWorks (numbers,pages etc) is not going to make you happy.
2. It integrates seamlessly with Google Docs (this was a big deal for me) . This implies you hook up your gmail account inside the app and bam all those docs are available to edit . You can also copy between ipad and google docs directly if you want to work offline or get the docs online etc.
3. It is optimized for the ipad, some of the other products seems to have an iphone feel to it or feels like a windows app
Now i suppose if you are heavily entrenched with apple products, then the iWorks suite would make more sense.
Sent from my iPad 2 using Tapatalk