What GPU would you recommend me to build my first mid-budget rig?

I've been mining RVN in my nitro5 (GTX 1650) for about two months, but I want to use my personal savings + mined RVN to build my first mid-budget mining rig. So what GPU would you recommend me to do so? Also it is better to start with 2-3 budget GPU or 1 high-end?