as a user of both wired & wireless network, i will give u some of my experience.
i have setup a wired & wireless network in my home.
cable modem -> Linksys wireless AP & Router + 4 ports Switch
wireless side -> go to 3 machines that's in three different room 'bout 25'-30' away.
wired side -> go to a Linksys 5 ports Switch -> connected to 3 other machines.
w/ all those machines, u could bet on i'll move files around all the time. (backup, install, storage, etc.)
and i could tell u, if it's only for simple surfing, etc. wireless is more than enough as even for most boardband is limited to 'bout 1MB or so. but just don't expect u'll get the full 11MB bandwidth even for just 1 user is connected!! it will not happen!! i'm hopping around 2-5.5MB most of the time. and also never, never expect those so called max. range on the box!! u'll be lucky if u coudl get half of the distance unless ur house is one big room!
if u'll ever need to move big chuck of files around or such. nothing beat wired network!! it's just much much faster (100MB all the time regardless how many user, if u r using a switch)!! u could definitly tell the difference!!
always go w/ wired whenever u can! it's much much faster, and much much cheaper. but if running/fishing cable between rooms or all over the house isn't an option, then go for the wireless. just don't expect u'll get a lot out of it tho.