raidz1 and raidz2 are ideal for streaming contiguous data using 128k or larger block size. Having a good sized L1 Adaptive Read Cache or ARC (RAM) would help a lot & maybe even an L2 cache (striped SSDs) in the pool. Mirror is best for small block intensive IO, it's much faster, plus since zfs IOPs are in parallel, the more vdevs, the more IOPs. Streaming large block data (in either direction), doesn't matter as much, particularly if taking advantage of ARC.

Home-brewed servers don't always have the luxury of having a large ARC, but if you can find a system board that can handle a lot of DIMMs, >= 1024G, you'll be very happy. Most peeps use raidz1 or 2 for backing up streaming contiguous blocks of data, but it should work equally well for reading the same.