As you are not yet a VW user, in your budget include some time for one to one training initially.
That will give you an invaluable springboard, also to harness your own experience and creativity.
RW is a worthwhile addition as it allows not only many rendering options, but also includes the choice of cameras and full lighting settings.
In addition the ability to create "Image Props" allow the user to create 3D objects out of 2d images and textures, probably RWs best feature.
I would also recommend the 17"MBP with the hi-res screen 1920x1200 and 4gb ram and the fastest hard drive on board (7200 rpm) 200GB or 320GB,
Also if you can wait until 14th October, Apple should be announcing their new range.
HTH