Specific model recommendations, or just in general?
I've owned a Thinkpad and Latitude. Hard to beat a Dell Latitude with Complete Care warranty and Pro Support. Especially if the machine is likely to see some hard use. They'll repair or replace it with next day on-site, or overnight shipping. You only talk to top tier techs in the US. However, that option will likely kill your budget. Thinkpad's are rock-solid platforms too. Support just doesn't match that offered by Dell. I've owned a couple HP consumer notebooks, but not a Probook. They really don't compare so I can't offer much insight.
My Dell Latitude was a D430, "thin and light" notebook. It was amazing the abuse that it took. It survived many falls, a couple of toddlers, and even a spill. It was finally done in when I landed on it after slipping on the ice. While they offered to send someone out next day, I opted to send it to the depot for repair. The notebook I got back looked brand new. New case, keyboard, touchpad, screen, etc. They overnighted me a prepaid box to mail it in, and sent it back second day air. Took only a few days.
The only other time I had an issue the wireless card died. Within 5 minutes of calling, I had talked to a tech and had a new wireless card on the way. It arrived the next morning, along with a new case back (in case it was the antennae). Came with clear instructions, and I replaced it in another 5 minutes. None of the long hold times, or walking through scripts making sure you had it plugged in, etc.