It's a good system, I'm sure you'd love it if you bought it, but I don't think you NEED it.
I no longer have a PS3 so the Blu-Ray and HDMI are good to have, I can still watch Blu-Ray movies if I want, and I can download HD movies and watch those as well, with just one wire from my laptop to my tv.
All of those little upgrades add up to make a better experience, but I still think you'd be better off with a faster CPU. I might even go so far as to say that you'd get better performance if you upgraded your current system to a 2.4 and that would cost you a lot less than 750.00, but you wouldn't get the other goodies.
Again, I can speak from personal experience since my previous laptop was similar to yours and my new laptop is similar to the one you want.