Computer - Apple Mac Mini M1 -$1,299.00

Apple M1 chip with 8‑core CPU, 8‑core GPU, and 16‑core Neural Engine

16GB unified memory
1TB SSD storage
Gigabit Ethernet

Monitor Setup - 2

GUI - HP DreamColor Z27x G2 -$900.00

In-Plane Switching (IPS) Technology
HDMI + DisplayPort + USB Type-C Inputs
2560 x 1440 WQHD Resolution
1500:1 Static Contrast Ratio

Full Screen Color Grading Preview- EIZO CS2731 -$1,177.00

27" In-Plane Switching (IPS) Panel
DisplayPort | HDMI | DVI-D | USB Type-C
2560 x 1440 Native Resolution
1000:1 Typical Contrast Ratio

Video I/O - UltraStudio 4K Mini -$995.00

UltraStudio 4K Mini is a portable Thunderbolt 3 capture and playback solution packed with the latest broadcast technology! You get broadcast quality 8 and 10‑bit high dynamic range capture in all formats up to 4K DCI at 60p, and 12‑bit high dynamic range capture in all formats up to 4K DCI at 30p. Plus, the built in SD card reader lets you mount camera media directly on your computer so you can start editing immediately!

Color Grading Panel - Tangent wave 2 Panel -$900.00

Multi Software support
3 x High-Resolution Optical Trackballs
9 x Programmable Knobs with Push Reset
9 x Programmable Function Buttons
Large Ice-White OLED Display Area

This is very basic requirement for cheapest 4k color grading solution. Price may vary according to the region.