Personally... No. The p750dm doesn't offer much more than what your current config can achieve, exept if you intend to max out the 40 Gbps bandwidth of thunderbolt 3 port for eGPU(980ti/titan x/quadro/pascal) or multi 4k display/5k display or external NVMe storage, in which case I would rather recommend the p870dm since it offers much more-
-Better graphics cards/SLI(you could SLI your existing card)
-Close to 100% adobe rgb 4k auo display (useful for your other hobby)
-Better cooling
-more overclocking, especially if you get it with Premas fully unlocked BIOS from a partner shop(with warrenty in some cases), or can wait for the free public release.
-More usb, GbE LAN
Uses all the PCIe lanes z170 offers, making it the best skylake desktop replacement....
That being said since you already have a great mobo I think you can easily wait till Pascal, Kaby lake and Skylake-E arrives.
If you are really in a rush to get the best system NOW, not satisfied with your current performance and have money to burn[emoji14]
1) for better GPU(s) performance, display and thunderbolt 3, upgrade to the p870dm(with Prema BIOS if you can)
http://www.eurocom.com/ec/future()ec
2) for better CPU, even better GPU(s), display and expandability, go for an enthusiast(X99) desktop, keeping your current system for mobility only(I'd rather wait for skylake-E)
Hope this helps[emoji1]
Sent from my Micromax AQ4501 using Tapatalk