Hi,
I also wanted to connect my DB600 to my wireless router and, my wife too had something to say about drilling holes to the newly decorated house, so I had to find a wireless way to do it.
I had a buffalo ethernet-wireless adapter that I bought for about £60 a few years back but it died within an instant of connecting it to the DB600.
I looked at powerline solutions but they are expensive.. £100 as a minimum and I know by reading other forums (network media tank forums) that they need pretty perfect wiring, otherwise you will get less speed than wireless.
I ended buying an edimax router that can function as an ethernet-wireless bridge. Got it for around £25 pounds (thats its usual price!). Works a treat and has 4-5 ports meaning u can convert to wireless up to 5 devices. I get quite good speeds. Enough to watch streaming content from the DB anywhere in the house. When I FTP I get 3 MBytes per second. its not the 8-10 you'll get with a proper cat cable bit it does the trick.
My wireless router is 54Mbps so maybe u can get better results with a pre-N router and bridge.
If you want to stream stuff from the PC its good enough for divX's... its just that software (VLC front end) thats crap... you cant really fast forward/rewind so I gave up on it. I also tried twonky and other Upnp AV servers but its just not good enough.
I just bought a popcornhour ($180) to play the divX's.. in fact it plays anything, including HD recordings...
Ideal scenario is (which is my next purchase) a NAS server. DB writes to the NAS, PC writes to the NAS, and popcorn plays it.
Oh and I used DBE with DB600 over wireless, no problem at all. (not tried OpenDBEdit)