Can anyone recommend a good all purpose inspection camera?
What kind if camera are you referring to?
an IR camera? I use FLIR, they can run about $2500 - 10k for house inspections. You can probably get away with the 2500 as you don't need high temperatures. I recommend taking the level 1 class to understand what exactly your looking for.
RIGID makes a whole line of inspection cameras. They range from $200 on up. One version is available at Home Depot. You can choose the features and price that suits your needs:http://www.ridgid.com/MenuDriver.asp?OptionID=647&criteria=inspection+ca mera
Good luck ...