Hi guys, I need some recommendations to replace my old unit. I've been using laptop for years but in fact I hardly move around. Laptop screen is a bit small for me so I have 2 other monitors set up as my main display. And I have external keyboard and mice as well so my laptop basically serve as a CPU.

Here's some info:
My budget is around RM7k.
Hardwares that will be reuse:
Dell U2311Hb
A Samsung 40" TV
Logitech keyboard and mouse.
Purpose: Redering, some high resolution gaming, mainly work.