Man of Honour
I use a Netgear GS108 8 port Gigabit switch on my 30Mb and it's working nicely. The 608 looks good but do you need Gigabit or is Fast Ethernet OK? The 2nd link is not Gigabit.
If the WRG614 has the ability to disable the DHCP then yeah you can use it as a switch.
If the WRG614 has the ability to disable the DHCP then yeah you can use it as a switch.