If you all are connecting to the same router, then the reliability factor you mention will be the same whether or wired or wireless. BUT, depending on your speeds and the router's ability to do QoS, you all should be able to enjoy connectivity to the network and the Internet.
Wireless will be the easiest solution, and at that distance and possible interference should be okay with the adapter I suggested or one like it, or even one of lesser quality. But if you want the guaranteed best connection to that router, then running CAT5E/CAT6 is going to be your best method. I do recommend using Plenum running into an attic, but if you're not striving to meet code and just need to get it done, standard CAT5E works fine...go no less than 5E though, that way you're good for gigabit LAN speeds or better. CAT6 if you think you'll be there a few years and might buy into the 10 gig network gear once it becomes more mainstream...likely a ways off.
Wireless is more susceptible to interference and regulation and being compromised than wired connection, keep that in mind as well. There are a lot of factors that can easily be added to this equation. But in the end, cable is the best option, period. If you can and are willing to run your own cable and terminate it, then really, you'll be providing yourself with better long-term infrastructure that a wireless adapter today only patches over...and depending on the standard an adapter can cost as much as or even more than a box of CAT5E, two keystones, two mud boxes and two single-gang plates...that depends on what you choose to go with. The wireless adapter I linked above is excellent for cheap. Just depends on what you want to do really.