I need to update my computer soon. Best option for proccesor and motherboard for Ubuntu and Houdini around $800-$1000 (US dollars)

Thanks.

To get the ball rolling, as I'm interested in this as well. A Ryzenn 2700X and a Prime B350M-A work very well. Comes in about $700AUD, has support for 1 full-length graphics card, 64GB Ram, M2-PCIe and USB 3.1