Media for 871W

Can anyone point to a model that is simila rin size to the 871W 4 port switch with wireless

I need it with the following spec.

4 x 10/100/1000 ethernet

802.11 b/g/n

CLI interface

able to define a monitor port(s) for upstream, downstrem or both ways traffic

doesnt have to be cisco but prefered but does have to be portable.

I want to use it as a wired/wireless tap for packet capture by clients

many thanks