Hinges work loose on many others as well! VAIOs are common for plastic to crack & stretch around the hinges.
At the end of the day it's going to be a personal choice, with everyone having different ideas and experiences. I'd agree the HP nx9xxx are a good no-frills business laptop, but one I bought for a customer required me to dismantle the CDRW tray and seat it properly, the other one has had it's RJ45 socket damaged (but I doubt that to be a weakness of the machine). Acer are reasonably well built and hard-ish wearing. Some of the older P4 Tosh Satellites are notorious for dead motherboard. You just can't generalise on a whole brand like that, but then you can't recommend a specific model either because they're outphased so quickly.
The T42 Thinkpad is still a solid choice though, or Z-series if you want widescreen. Not cheap but then quality costs. I bought my T41 from eBay for £500 and have since upgraded it to Bluetooth and a faster 1.7GHz/2mb processor (over the 1.6/1mb that it came with)