The 2300DL has three advantages over the 2300W: Ethernet, expandable memory, and LCD display on the machine. The 2300W is USB (1.1) or serial only, is limited to the 32mb of memory it comes with, and has no LCD display (all settings are controlled via software on the host PC). Home users can probably live with all three differences. In a corporate environment, you'd prefer ethernet and might well desire more than 32mb of memory.
For most home users, the $200 difference doesn't come close to being worth it. (Make it possibly $300 with the $200 rebate plus the $100 rebate that expired on 11/13 if they both work).
As for the cost of toner: The printer comes with enough toner to print roughly 1500 pages. A new full set of toner refills rated for 4500 pages will cost you about $400, or about 10 cents a color page. The B&W toner cartridge alone is about $70 and prints 4500 pages. So if you primarily print B&W, the cost per page will be less than 2 cents, which is not too bad.
Kwad