I have experience with EMC DMX, Clariion, Hitachi and EVA. In my experience, EVA gives you the best bang for the buck with ease of use and performance. My advise (If you haven’t implemented it yet) is to go for an EVA6000 or 8000 if you can. That will offer you the best expandability. Any upgrade to a maxxed out 4000 requires downtime. Also, you should fill it up with disks. The EVA performs the best when it is filled with disks. Performance will actually double if you double the amount of spindles.
I would go straight to the cluster. There is no problem with clustering a MS SQL server. Make one large disk group on the EVA and carve three LUNs: A 1GB LUN for quorum and two large LUNs for data and logs.