Not so sure whether this is the correct place to ask this...if not, dont kick me

I'm building a new system...and,
I got "another" budget around RM1,500 after this raya fest
What I need is suggestion for:-
• GPU*
• Full HD Monitor LED** (prefer one with DVI / HDMI input)
• Custom extention cable; looking for one suitable with my color theme
This is what I already have since early this year...
Collecting one by one each months

The color theme are BLACK-RED-WHITE
• Mobo: MSI Z97 Gaming 7
• CPU: Intel Core i5 4690k
• RAM: Kingston Hyper X Fury 32GB 1600MHz (4x8GB DIMM)
• Chasis: NZXT S340 White
• CPU Cooler: Corsair CX750M semi-modular
• 1x 128GB Transcend 370 SSD
• 1x 128GB Plextor M6e M.2
• 2x 2TB WD Green 7200RPM
*GPU
• I'm a photographer/videographer. Looking for GPU that beneficial for my video rendering & photo editing. Lots of people say get GPU that have CUDA... and that would be NVidia... if NVidia, the Physx also beneficial for gaming tech... not sure whether would go for multi-GPU setup or not (tight budget)...if ATI, with same price range to NVidia, perhap I could get away with higher VRAM (am I able?)
**Monitor
• Would love to have TWO Full HD display setup... but then again, if NVidia (above)... most survey said that NVidia Surround is not yet stable... would love to do the Eyefinity with Flex Technology... then again (above), I would lose the benificial of CUDA from NVidia... Grrrr... Linus from LinusTech / NCIX suggest to run both... but from the setup show in youtube, it's kinda "seems like I'm not capable of it"...