Best configuration for bcache/md cache or other cache using ssd

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Hi guys, i have one doubt...
i will buy one server and my client want a configuration with SSD + HDD
i don't know yet what SSD will be used if anyone have a suggestion
it's wellcome...

HDD will be a SATA 7200rpm with 2TB, SSD will be ~ 160GB or less (must
be cheap and enterprise level)

he wants a RAID1 level over HDD and a cache (bcache/or md cache layer
of kernel 3.9) over this md device (raid1)

i'm thinking something like...
raid1 over ssd + raid1 over hdd
use ssd raid as a cache to hdd raid, is this ok?

well that's my problem:
1) suggestion about ssd device (size don't need to be 160GB maybe a
better device with bigger space exists and i don't know...)
2) what configuration should i do to create the md device
3) i will make this (cache) only for HOME partition, others partitions
will only have md raid1 of hdd drives

thanks guys

-- 
Roberto Spadim
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