So sorry PB! Somehow I missed this question.
Everyone thinks their way is best, me included, so I'll tell you why.
I think it's best to have a WP blog set up your existing site. Then you are driving all your traffic to and focusing all your energy on one site that has 2 rooms, if you want to think of it that way.
On 5 Star I have 3 rooms. My main static site which is what you see when you hit my homepage, then later I added the blog on (as a subdomain) and later added the forum as a subdomain.
This way you don't have another hosting account, extra passwords to remember or anything. Just add it to your existing site. (assuming it's the same topic/niche.)
It's supposed to be very easy to set up WP and you can install right from Cpanel. HOWEVER to tweak a theme the way you want it and get all the right plugins installed AND working right and not conflicting with each other, is just more than technically-challenged-Linda would even consider handling. Plus I don't have time to mess around and waste and I know it would take me hours of goof ups to get it right. I just know me. It would take me 3 months!
I know someone that will set up a WP blog, with whatever theme you want and all the plugins you need for $50 - $100. So I would never set up a blog, much more cost effective for me to just have her do it. I have not used her yet, but she's a member here, so I trust that she'd do a good job. Let me know if you want me to hook you up with her.