Which interfaces have the lowest latencies?

I don't think you'll get any concrete numbers. Your computer has a lot to do with it, just too many variables.
 
Indeed. Any decent interface with have an internal latency of only a couple of milliseconds. The real fun starts once the digits get into your computer and get tied up in buffers etc.
 
RAM and CPU power, yes, but also how efficiently your DAW software uses them. Transfer speed too/from your hard disk can also affect latency.
 
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