hello, need info on which topology you currently have and what do you want to achieve, all layer 3 switches for example? all on layer2? . several wan/lan routing scenarios, all redundant or not, amount of servers you have, office branches, vpn tech you have, # of users on each office, # of voip, do you have QoS? Wifi ap's? which kind of routers/IDS/IPS you have or do you need that as well?
if you dont know any of this answers I can help you be successful through guidance and examples.
best regards and looking forward to hear from you,
Pablo