graphic card for photoshop and proshow producer

Building up a new PC, specs:

i7 3930k, asus p9x79 motherboard, 16gb RAM, Samsung 830 SSD

I'd like to use this (render) machine mainly for AutoCAD, Sketchup, 3dsMAX, PTGui, Photoshop CS5, ProShowProducer. I work for architects, so I do a lot of photography and artist impressions.

Now I am contemplating the graphic card and want it to especially usefull when rendering from Sketchup or ProShow Producer. I was thinking of:

1) AMD Firepro V4900

2) Nvidia Quadro 600

3) or just another Geforce GTX for its Cuda cores (Asus GeForce GTX 650 DirectCU TOP or Asus GeForce GTX 660Ti DirectCU II)

I just cant make up my mind, does any of you have a good idea? I dont play games.

Thanks

AB