Guestions about Switces

Hi, have a few questions... I wanna buy some new switches but before i do that i just wanna know if OpManager

supports "D-Link", "SMC", Netgear" Switches?

soo long they support SNMP they are possible to monitor:

-Traffic each ports
-Status each ports
and get the overview of the switch panel in the front with green and red lights for the status?

I just ask since you only have Cisco, and 3Com names everywhere...