I've decided to go with an all-flash Compellent array. I got a great deal on a SC4020 with 1 x 6 pack SLC and 3 x 6 pack of eMLC (32 TB raw)!
If Dell can continue to offer the deal they gave me to other people none of these flash start up companies stand a chance; not even remotely. They are the only ones who even offer SLC.
I love how the array works. Everything gets sent into Tier 1, RAID-10 first, on SLC, so the SLC absorbs all of the writes first. Then the system can organize and use a proper wear leveling algorithm to move data into eMLC.
Originally I really wanted to go NFS so I could get per-VM IOPS/metrics. However, that's a moot point if the array can kick out 300K IOPS.
I've been using FC for years and am sticking with it. I'll just upgrade the switching to 8 Gbps. The array supports 16 Gbps fibre but I don't want to incur the expense of 16 Gbps switching and Mez cards.
I should have this new all flash Compellent in our shop and online in 2-3 weeks. I'll post a small review once I get it up. I've been using HDS for years. So this will be my first non-Hitachi array.