It's not clear if you're putting together gear for a team/company or just yourself.

Is that the budget for computers or the entire game budget?

A simple mobile game (at a professional level where you actually stand a chance of making a profit) probably involves about $50-100k in labor costs (assuming standard rates for experienced developers in a first world country). Also if hiring contractors, they will supply their own computers so you don't need to buy anything, except your own PC and a central server (NAS/etc) for file storage if you want.

Dedicated machines for automated testing is necessary if you're putting together a large team... but aren't terribly useful if it's just you. I'd save that $10k and spend it on hiring contractors when you need to.