pixelator, I would switch that around so you have the 24 port switch as close as possible to the core, unless the 24 port switch is only 100Mb and the router is 1Gb. What's the speeds of the switches? I know most routers are only 100Mb.
RGoolsby, If you use option 1 you will need to enable DHCP on the wireless router. However, this will cause the wireless connections to be on a different sub-net and inaccessible to the rest of the network. Option 2 is your best bet. You will always loose internet connectivity during a core reboot (it's serving the net to the rest of the network), but as soon as the core is back up so will the internet connectivity. One thin you need to do is make sure you do NOT use the External (WAN) port on the router. Connect the Core and the diskless MD's to the Internal (LAN) ports. That turns the router into a cheap switch. There should be other setting on the router you can set to actually disable the WAN port and operate in switch mode completely, depending on what router you have.