Check your application software for 64-bit compatibility first. If you are stuck using 32-bit production software, almost any mid-tier hardware will do. It won't make sense to build out hardware your software could never use(Example: Finale).
If your software is 64-bit compatible, the sky is the limit. Do not get a motherboard with an onboard/integrated WiFi adapter or if you do, you will want to disable it and use a cable. I would also recommend an external DAC like the Roland OCTA-Capture USB mixer.