Hi Ovidiu,
I have the perfect solution for you: We recently launched a presales email address. You can visit our contact page at:
http://www.wordfence.com/contact/
Email the presales email address and this goes into our priority ticketing system. Please note that we don't accept support requests via this email, only presales questions like the ones you're asking. We'll give you a priority response probably today if you email right now. I would open the ticket for you myself but I don't have your email address. So just cut and paste the message above into the email.
Please note that the page you linked to redirects to our home page which actually contains more information that that original page including product comparison. But please email presales and they'll help.
Regards,
Mark.