The wireless issue is a non issue as the SB has buffrs etc - all it does is wirelessly send data - not analog sound , the worst that can happen is stuttering if the wirelss network is lousy or there is some weak signal or interference which is highly unlikely.
You connect using SPDIF cable (75 ohm - like those video cables with yellow rca plugs)
My suggestion , if you have a LOT of cds to rip , is to buy 2 x usb external high speed drives and use em as well as your laptop internal simultaneously ... so you rip 3x cds at a go.
1 tb external will hold roughly 3000 cds ripped using FLAC.
A standalone with a soundcard is a waste - you would want it to output spdif to the dac and it would have to be close to the system , don't even go there,
Just about ANY old pc will handle the server side of things , so if you want to just use it as a ripper and a music server , you can go cheap 2nd hand running something like XP pro - low powered laptops running vista are problematic.
ripping is a pain in the butt , it can take as long as 20 mins a cd if you are paranoid and use secure modes etc - you can go a LOT faster if you use other modes , the thing is , it links to accurip and if you go fast , you will see iff the rips are accurate - depends on you whether you want analy ripped or speed.Good idea is if you have a kid is pay THEM R2 or so a cd to rip em anally so you dont have the pain in the butt of doing so