I haven't read thru the responses in this thread but I can tell you how to get rid of roaches!
Get you some Raid brand fumigators, settle for nothing else.... you will need to turn your smoke alarms off and be out of the house for at least 8 hours.
I recommend at least twice the number of fumigators recommended per square footage. I used to live on the beach next to a restaraunt so I know how to handle this kind of problem....
And after this I was roach free!
Sometimes you just gotta get nuclear with them little varmints, lol.