Design hub in datacenter

[hmc250000]

We have a catalyst stack of 3850 switches that is used as our core L3 switch in our hub site in a datacenter. We have a dual homed ISP connection (HSRP on the inside active/passive). 

It's pretty simple, about 2 to 3 internal L2 switches, 1 L3 core switch (catalyst stack) and 2 ISP dual homed routers. 

L2 switch --- L3 switch ----- ISP link

We've had this for a while now. Is there anything better now that we should consider? Would it be worth switching to Nexus?   

[marce1000]

  - Have a look at https://www.cisco.com/c/en/us/products/switches/switch-selector.html?guide=data_center|lantype|lannewswitch|lancore#~select-switch
    or start from https://www.cisco.com/c/en/us/products/switches/switch-selector.html  and make further choices according to your needs.

  The current ISP connection or 'local loop' is rather insecure ; traditionally you will have a DMZ network in between and also a firewall , 

 M.

[hmc250000]

My apologies, there is a firewall and DMZ. Just forgot to mention.

[MHM Cisco World]

Nexus is mainly for DC leaf-spine and it more expensive than C9K and C3K 
I think you dont need Nexus in simple enterprise DC.

MHM