* I have scraping experience of total 46 newspaper in C# webclient and HtmlAgilityPack. Among these 35 are local newspaper of Bangladesh and rest are international news portal like bbc, cnn, huffingtonpost etc. The software downloads all the latest news in every 2 hour from 6 am to 4 pm. I think i have good knowledge and expertise to solve your problem.
*The software scrape atleast 8000 urls at a single run. We scrape NewsTitle, NewsBody, ImageUrl, Publish DateTime.
* One thing to note, if the site to be scrapped is javascript loaded entirely, then the scraping in C# has to be done by webbrowser which is buggy and prone to crash frequently. Hope the site is not javascript loaded.