Choosing Rack Servers for a Growing Business – Where to Start?

I’m diving into rack servers for our expanding business but could use some advice. We’re looking for something reliable, scalable, and that fits within a budget (not a small one, but reasonable). I’d love input on what to prioritize when selecting a rack server. How important is CPU core count vs. memory capacity for general-purpose applications? Also, what are your experiences with cooling needs or power management? Any brands or models you’d recommend? Thanks in advance for helping a newbie make the right choice!