The professional version is an expense that might be worth looking into if you have numerous people working on your social media campaign. You are also not limited by the amount of social media accounts that you can maintain and manage. Here's a link to a Free 30 Day Trial of HootSuite Pro
Another feature I like about HootSuite that my husband pointed out is you can actually have your RSS feed automatically generate posts into hoot suite and then collect analytic about those and generate more posts. This is especially good so you don't forget to go back if you schedule your blog posts for later in the date. It stream lines what you are doing.
The other advantage of using a product like Hootsuite is you get the opportunity to adjust the same post for multiple networks. Your posts on Facebook and Twitter should not be the same, so this is advantageous to be able to add other wording on a Facebook post that you had to shorten for your Twitter post.