I figured i would start with having someone write unique content for me for the top 100. and for the rest find someone really inexpensive to go out and copy information, and maybe use an online tool that modify's some of the words. also if they grab the descriptions from a 3-5 sites, then maybe google wont consider it duplicate content.

Overtime if i have success with the top 100, i will add another 100 or so every month.

good plan?

I have other content that is valuable to my user, but a description that other sites also have would also add value for my user.  but im really only gathering it for SEO reasons.  I just dont know the best way to approach this mammoth task.

I own a site that that has about 15,000 pages that need some description content.  I plan to hire someone to retrieve or create content for each of these pages on my site.

each page needs about 500 words.

I was thinking that there is probably three ways i can go about this.

If I hire someone cheap I can probably have them copy data from about 20 different sites. using about 5 sources for each page description.

I can hire someone that has some experience writing english content, and have them go to a few sites and then in their own words summarize the description on my site.

I can hire a great content writer, have them do research on each page, and create completely unique content.

I probably will do some combination of these 3 things. (great content writer on a few pages, since thats all i can afford to do) and the rest do the cheaper route.

Is copying sentences from multiple sources a good idea? or does the content really need to be original?