jmrukkers wrote:
I've got the Focusrite Scarlett that Dick recommends, it's a great trouble free unit, the only downside is that it is a bit big. I'd recommend Focusrite over Steinberg for the Mac, since Steinberg always takes ages to update its drivers when a new version of MacOS comes around, whereas Focusrite uses native MacOS drivers, which don't need updating.
This. Ensure the device supports Apple's Core Audio. It's proven, works out-of-the-box and is, to me, faultless.
You could also consider second-hand interfaces. If they support the discontinued Firewire connectivity (which is why they're often cheaper), Macs support them via an adapter cable into one of the Thunderbolt ports. My 8-in Terratec Phase88 device I record my drums with (I use 7 inputs concurrently) is a Firewire 800 machine which I connect via the Thunderbolt port and a Firewire-Thunderbolt adapter (OK, that cost me £25). It has never caused me any problems or any latency issues. I paid £95 for the interface second-hand from a chap on Basschat...