Eh, normally I would run the extra wire, but in this case I'm just going to run the cables for the drops that I'm putting in right now. The landlord provided cat5 runs between the 3 bedrooms, leaving one bedroom to be the room where the cable modem and router would go. I'd prefer to have that equipment in a common part of the apartment, as opposed to one's bedroom, just so it's in a more convenient place in the event it needs to be power-cycled or whatever, so I'm going to see if he'll let me do the wiring myself.
Since I've got a first-floor apartment, I should just be able to drop the cables down to the basement and run them along the joists in the basement. Seeing how the installer for the existing cat5 runs mounted the wallplates and ran the cable, I should be able to do something similar for the drops I'd be putting in. Just a matter now of getting a layout together and getting the landlord's approval.
Thanks for the link to deepsurplus.com - looks like I'll be ordering my jacks and wallplates from there if/when the time comes. Think I'll have to find a local distributor for the cable, though. Home Depot and Lowe's around here only carry Cat5e cable.