What is a good PDF mobile app for the iPad?

Looking for something less than $10 in the app store (non-subscription based). Something that will give me more like editing, create PDF from Word, Excel, and PowerPoint, Convert images and scanned documents to PDF, Export PDF files to Word, Excel, or Powerpoint format, Access via desktop and mobile. Adobe charges $9.99/month which is priced to high.
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I Use PDF Expert 5. Have a look on the apple App Store for it

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Leslie BloomCorporate & Product Marketing ManagerCommented:
Combine that with Documents 5 to help you manage and sync your files.

Document 5 is made by the same company as Expert 5 and work seamlessly together, allowing you to work on documents in one and saving changes in the other.
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