A company like Nimble, was created to address what the big players werent doing. Simple to setup, simple to license/all-inclusive licensing, easier maintenance, etc. Their hybrid approach was better than the incumbants. Their all-flash was more of a "me-too," to address the competition IMHO. They now have I think NAS capabilities.
Much of Nimble was founded by ex NetApp and DataDomain folk. As such, I think NetApp is a fantastic NAS and is pretty hard to beat. As a SAN, I think they a second rate and more of their cool stuff (data services) is on the file side and not block side. But with NetApp, you do get a true enterprise product, that has a tremendous amount of maturity over a startup like Nimble.
If going NetApp, I'd look at running Hyper-V over SMB3.0. Again, this is where I think NetApp shines, which is on file services and not over FC/iSCSI access.
If Nimble, FC or iSCSI is their preferred method. So you may not need a new FC SAN, and can remove that cost, and stock with 10GbE.
Veeam supports Nimble snapshots and NetApp, if that tickles your fancy. But truth be told, as cool as that sounds, it's an incredibly complex implementation that you'll troubleshoot more than you want or think you will. This goes for all snapshot, lan-free, san basd backup technologies. Man I hate that concept these days, and the grumpy unix admin's that think they need it...