document management systems for .net

I have a new requirement to build a document management section to our existing asp.net mvc 3 application. We wish append multiple files to products. The files will be very large 1gb and will be 开发者_运维问答various file types.

My question: are there any good .net libraries that offer some of the following

• good categorisation of files
• preferably asp.net mvc
• plugable into some kind of data storage like
• can manage large file
• some kind of ftp file upload option.

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Have you considered SharePoint?

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I'm looking at the same thing. Some options:

1. SharePoint Foundation 2010 (free version)
2. Kooboo
3. Atomic CMS
4. Orchard CMS

The bottom three are all MVC based and open sourced.