Choose equipment RB3011UiAS-RM VS RB2011UiAS-RM

Excuse my English, I’m from Argentina. I will use the Google translator.

I need a router for an office.
My configuration is:

1 Linksys E900 router with DD-WRT + Cisco SF 24-port 10 / 100mbps switch

1 IBM Server running online 24-7 with a supermarket system which uploads invoices and receives orders.

8 Network Devices (PC + Server + Printer)

2 Access Point that give Wifi to 4-5 cell phones for whastapp.

1 DVR with 12 HD cameras

2-3 Remotes RDP

Future 2 ISP

Currently it works with a single Internet provider and in the future the possibility of two.

What router do you recommend for this configuration?

The options are:

750GR3
RB2011UiAS-RM
RB3011UiAS-RM

I would replace the basic Linksys, I can recycle the Cisco Swicht.
RB3011 is too much or RB2011 is poor?

Thank you for your time, I was the youngest and excuse my English.