I'm guessing that the G3 is close to the DSL line and can be ethernet connected..
That leaves the PB 233 to buy a wireless card for, and a base station to connect the three together (DSL modem, PM, and PB).
I recently sold a WaveLan bronze on Ebay for $50, that worked superbly in a lombard (bronze PB 300), using the airport client software. I do not know for *sure*, but I would be surprised if your 233 didn't do as well.
As for the Wireless Basestation: I am using the original Airport, but standards prevail here - any decent company does just fine - PC or otherwise. If you want tech support from the company, consider farallon or macSense (both highly regarded). I believe SMC will also stay on the line after you tell them you have a mac.
I have bought D-link network stuff, and find their manuals clear and easy to follow - I ignore the cheesy IE screen captures