Although finding best gaming monitors in white color leaves us with very limited options, I have a found this monitor on amazon which i think is best fit for you. It is white and perfect for your minimalistic setup:
Now, answering your question of which resolution is best 1440p or 1080p, I would recommend to go for 1080 p monitor. It is best suitable for your mentioned hardware specs beacuse it will give your decent fps in modern RPG games like Witcher 3, Pillars of Eternity II: Deadfire. about 60 to 70 fps in ultra settings. If you go for 1440p monitor your fps will drop and gaming won't be too immersive.