Re: Not enough...
Network raid does have an overhead, but it also allows you to do some very clever things that just aren't possible with other architectures, it also provides more availability out of the box which continues to scale along with performance as you add more nodes, just the opposite of Equalogic. Fault tolerance and availability have always been about sacrificing capacity, raid overhead, spares etc, Yes you do lose usable capacity, but that capacity is relatively cheap being based on industry standard server hardware,
Equalogic is not known for it's efficiency once you start using snaps or replication, both of which have a huge block sizes (MB's) in comparison to Lefthand so any perceived usable capacity advantage can disappear rapidly once you start to use features. As for striping across Dell Equalogic boxes, it's not really recommended, lose one of the arrays in that configuration and you can kiss goodbye to your data. That's why you see a lot of shops with many Equalogic arrays all being managed in isolation, that's the reason Lefthand has Network Raid, something I'm told Equalogic are also working on, in which case they know they have an issue otherwise they wouldn't be looking to fix it.
The more margin you have in a product the deeper the discount you can sustain, that's why you'll see deeper discounting on higher end gear, maybe your reseller isn't passing the discount on ? but I do agree LeftHand needs sub LUN tierig even if it's just to put a tick in the box.