Best ms office or office compatible app for iPhone and ipad

Hi

I own an iPhone 5 and an ipad 2

I'm on iOS 6

All legal no jailbreak

What are the best office apps ?

Needs :

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xl : read + save locally on phone / pad . Minimal edit .

word : Read , *edit * and save locally . Good if formatting I'd preferred

PPT : read and save . Minimal edit. Probably NO edit

PDF : Read and save locally . only read no edit .

Nice to have : cloud saving support

All office files / app to work without net / wifi ... Ie cloudon etc not useful for given situation

Should be possible to mail saved files ( either from App or some way )

Cost

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Free preferred . Paid ok<$5

Other notes

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Seen docs 2 go . Unable to decide

Await community views and ideas

Thanks in advance

Regards

Subu