Build Upgrade - £2500 Budget

[Audio_Gorilla]

Hi all, I previously built my own rig a couple of years ago and now I'm looking to upgrade.

These were the previous parts I purchased;

1 x Gigabyte Z97X-UD3H-BK - Devil's Canyon Core i7 4790K CPU & Motherboard Bundle **£35 Saving**
2 x Gigabyte GeForce GTX 970 WindForce OC 4096MB GDDR5 PCI-Express Graphics Card (GV-N970WF3OC-4GD)
1 x Kingston HyperX Beast 16GB (2x8GB) PC3-19200C11 2400MHz Dual Channel Kit (HX324C11T3K2/16)
1 x SuperFlower Leadex GOLD 750W Fully Modular "80 Plus Gold" Power Supply - Black
1 x Corsair Hydro H105 Extreme Performance Liquid CPU Cooler (CW-9060016-WW )
1 x Phanteks Enthoo Pro Mid Tower Enthusiast Case with Window
1 x Crucial MX100 256GB SATA 2.5” 7mm SSD + 9.5mm Adapter (CT256MX100SSD1)
1 x Seagate Barracuda 2TB 7200RPM SATA 6Gb/s 64MB Cache - OEM (ST2000DM001) HDD
1 x LG GH24NSB0 24x DVD±RW SATA ReWriter (Black) - OEM

I have a monitor, mouse + keyboard etc. Just looking to upgrade certain parts of the current rig and was hoping I could get some advice on what I should upgrade based on current components.

Thanks

 

[Audio_Gorilla]

Thank you for the replies,

As suggested I think I'm just going to put a new gpu in there (possibly SLI the 1080TI)

As for the monitor, I currently have Acer XB270HA 27" G-Sync 144Hz Gaming Widescreen LED Monitor - Black/Red