Wireless connection to multiple printers

So, I'm going to get a wireless internet connection (probably Verizon DSL), and the wireless modem (which I imagine will have an Ethernet jack on it) will be in one corner of the room next to the following printers:

Seiko SLP-440 label printer
RS232C serial port
USB port

HP Deskjet 3050 All-in-One Printer
WiFi 802.11b/g/n
USB 2.0

How can I make sure my remote laptop(s) can see both of those printers wirelessly? I suppose the HP 3050 is slam-dunk, but that Seiko looks like a problem child.

For the Seiko printer, you will need to get something like this...

http://cgi.ebay.com/Silex-Sx-2000wg-...item35b2c5dd43


The HP will work out of the box just fine.

Somebody at work suggested this would be better (and cheaper):

IOGEAR USB 2.0 Print Server GPSU21 Print server - Hi-Speed USB

The "magic box" (for the Seiko printer) does not itself need to have a WiFi connection, as it will sit next to the wireless modem (which has an Ethernet port built-in).