What Surface should I get? Help me decide...

I'm in a bit of a dilemma. I am going to be adopting Windows 8 when it comes out. I will first be updating my laptop on October 26th with the Windows 8 Pro for $40. It is an HP dv7 17 inch with 4GB of RAM and a 750 GB Hard drive. I still plan on using it as my main device but I would also like to get a tablet so that I can take advantage of the touch interface and easily work with it where my laptop is too big.

As of now, I think I will be getting a Surface (probably in December), but I do not know if I should get the Surface RT or the Surface Pro. I figure the Surface RT will be fine since I have my laptop, but I like the specs of the Surface Pro and don't really want to limit myself with the Surface RT.

Anyone have any advice? Which one should I get?