No SAN / NAS on the market provides a decent SMB3.0 solution. Tegile and Tintri say they do but both their implementations are incomplete compared to what Windows does. If you're serious about doing SMB3 then either DAS Storage Spaces or iSCSI presentation to Windows header boxes are your only real options.
Tegile are great if you have lots of existing infrastructure that needs to be combined into a single platform (SAS, iSCSI, FC). Otherwise there are better solutions for less money / more speed / more features.
I'm very surprised that nobody can touch NetApp on that pricing. Rolling it back a bit if you're looking for a Hyper-V storage solution I'd look at Pivot3, Nimble, NexSAN, perhaps HPE MSA - any of the Hybrid 'fast and basic' storage vendors who can offer plain iSCSI solutions. There aren't any vendors on the market offering deep integration into Hyper-V in the same way VMWare does. We get this requirement a lot and most people just go with their preferred iSCSI vendor. EMC probably can provide a VNXe solution for that kind of money but their support has been atrocious lately and I don't see it getting better any time soon.
On the bright side your 40 - 50k should cover 10GbE switching and cabling too.