my system would serve you pretty well, with the addition of a Laser printer:
-Broadband modem connected to Airport Extreme base station
-connected to the extra Ethernet port on the base station is a HP 7110 All-in-one with Ethernet print server (I recommend getting the 7140 or 2510 instead). the good thing abou this is fax and photocopy capability. the bad thing is Mac drivers can be bad when a new version of OS X comes out. scanning doesn't work well to the Mac over the network, but I use the Windows machine to scan and then give the files to the Mac. what can you expect from HP? but even with the driver issues, i trust the hardware much more than an Epson or Lexmark.
if you get an ethernet switch or router, you can connect that to the Cable modem, then connect the 2 printers, the Airport base, and even another computer or 2.
connected to the wireless network are 2 powerbooks and 1 Win XP computer (accessed on the Mac via Remote Desktop Client)
Treo 600 Palm OS smartphone is a good solution for Mac users who want an all-in-one phone and pda. stay away from Pocket PC or Smartphone. my treo syncs via USB cable with both Entourage and Address book, using the Missing Sync software. Wait about a month and get a Treo 650 with bluetooth. can't wait? get a Sony Ericsson p910 or a Nokia Series 60 smartphone. but the Treo 650 is probably worth the wait.