Choosing a Surface; RT vs Pro

I want to get a Surface but I'm having a really hard time choosing which version I should go for.

Pro has a Pen digitizer and a Higher Res screen, but the RT is thinner and lighter and as a portable device I hold that in quite high regard.

I'm quite indifferent to having full desktop access, as I don't feel it necessary in a Tablet.

RT is also available 3 mths sooner than the Pro.

So what do you guys think? what one will you be after?