SME Network Consultancy

Anyone here deal with enterprise networks ? I’m in touch with a medium size company ( 4000 users, 1000 Pc’s, several sites).
They are looking for a vendor neutral advice regarding replacement of core network switching. Currently they are mixed HP/Huawei shop.
Core network is HP 5400zl switches, with Dell Equalogic SAN/ Vmware(Vsphere) virtualisation stack.

There is a budget of ~£60k for new switching, but in the first instance they are looking for consultancy on best upgrade paths from the current infrastructure.

Feel free to forward it on to others if you think they may be interested.