I have to agree with Calvin, the EVA series has been around for a long time and have mostly heard good things about them. I personally have an EVA4400 and a P6300 in our environment and they have been very good. Compared to the newer products out there they are somewhat lacking and are very much traditional SAN architectures with no auto-tiering functionality (at least that I'm not aware of).
In terms of an upgrade from where you are it greatly depends on your requirements and moving to the next product in line isn't necessarily the right move. While the 3PAR's do look very good you need to analyse your current environment and determine the required tiers of storage.
I.e. do you really need SSD? Are you currently IOPS or throughput constrained? Also your DR/BCP requirements need to be looked at as this might also sway your decision based on array features or integration with third party backup tools. For example, you might consider the 3PAR stuff if you are an existing Veeam customer as they are releasing integration with them shortly (currently integrates well with the Lefthand/Storevirtual gear).
If you are already running an extensive fibre channel infrastructure you might decide to stick with this investment and purchase another FC attached SAN, putting iSCSI or FCOE options at a lesser priority if you don't have budget to buy new switches, etc.
I used to jump straight to capacity first when looking at new storage but have learnt the hard way. Start with performance requirements first and work backwards to availability/redundancy and capacity as the latter ones tend to be easier to address later.
Hope this helps!
Cheers,
Ben