Hi Sir,
We are a team of 4 members having 4+ years experience in magento and its complex solutions like product import, upgrade,etc.
We can add blog into magento either using a free extension from aheadworks or by installing fishpig extension. In aheadworks extension, you have to handle the blog posts from magento, whereas in fishpig extension, you will have separate login for wordpress to maintain blog posts. Also you will have lot of features like inserting products into posts and assigning posts to products in fishpig extension.
Thanks