just a data point: for our enterprise customers, 800GB intel datacenter 3500 series flash drives (the penultimate model good for most write-heavy applications)

just a data point: for our enterprise customers, 800GB intel datacenter 3500 series flash drives (the penultimate model good for most write-heavy applications) are already basically the same price as 600GB 15k SAS drives and actually cost less if you drop the raid controller which isn't that great with ssd (in our experience).