SATA drive: best write thruput (minus write cache) & least power draw?

I am seeking a SATA disk drive with a good combination of write throughput (specifically with its write cache turned off--this is quite important) and least power consumption.

I will be using such a drive in a RAID configuration.

I am finding thus far the disabled-write-cache requirement to be a major performance obstacle. I appreciate any specific references to drives that perform in sequential-IO, write-throughput streams with their write cache turned off. (I am not concerned with random-IO-oriented performance, just sequential IO).

Does anyone have any particular suggestions for drives?

Alternatively, can anyone recommend any particular methods/processes/resources/reports/analysis that might make my search more efficient?

Thanks in advance for any help,
-Matt