21:9 screens are generally over 30 inches, with 25 inches being the smallest. The price of monitors is above 1,500, and many are above 2,3000.
So, considering it this way, your machine must be equipped with at least 1W or more to be able to withstand the pressure.
cpu I7-4790K 2000
Memory? CORSAIR Avenger DDR3 1600 16GB (8Gx2) ? 900
Hard drive? PLEXTOR M6Pro series 256G 1100 ?Western Digital (WD) black disk 1TB 7200 to 64M ?540
Motherboard?ASUS Z97-A motherboard?1000
Graphics card?Dataland R9 290X water cooling 4G 1060/5400 4GB/512bit GDDR5 PCI-E graphics card*2 ?3000*2
Power supply? Zhenhua (SUPER FLOWER) rated 1300W Iceberg Kingdee 1300 power supply 1000
Chassis? Yes Jie (NZXT) Phantom II Full Tower Chassis White (Fully Modular/Highest Liquid Cooling Radiator Support/Fan Controller) 650
Cooling?Tt (Thermaltake) Pacific RL240 Water Cooling Cooling Kit Top D5 Water pump - ultra-thick cold radiator pure copper micro-channel cold head - rubber anti-shock fan? 2800
Add a keyboard and mouse? It will only cost less than 1000
Finally, the monitor,
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LG 29UM65-W 29-inch AH-IPS panel 21:9 ultra-widescreen LED backlight LCD monitor white 3000
or
Samsung (SAMSUNG) S34E790C 34-inch LED backlight Curved monitor
Samsung 34-inch 21:9 curved monitor! Ultra-high-definition 3440*1440 resolution, flicker-free screen, liftable stand, wider field of view for LOL and DOTA? 7500
The total price is 18k~22k.