I see more Aquatica and Nauticam housings out there than anything else. I live in the US and dive locally and in the Caribbean. When I do my tech diving trips, I see Aquatica exclusively. Im not saying that I dont see Ikelite or Sea & Sea out there though. I knw Ikelite has a history of great customer service. I personally have Aquatica and their customer service is outstanding as well.
Since you travel a lot, you can get your hands on some housings if you visit Backscatter in Monterey, CA or Reef Photo in Fort Lauderdale.
Ok, this is a simple fix.. I assume that your folders are greyed out and have a ? Mark over it. Right click on the folder and choose the option to "find missing folder" and then you just have to go through and find the images. Another option would be to assign your hard drive the same letter as what you had on the previous laptop, i.e. move it from H back to J. In windows 7, hit the windows icon on the lower left side and type in "disk management" in the search bar and press enter. This will bring up that dialog box. Look for your hard drive i.e. letter H and right click and choose "change drive letter and path". Click change again and on the right side of the dialog box you will see drive letter H with a drop down arrow, click on it and select J. That will reassign your hard drive to J and you may not have to go through and find each and every folder to point lightroom to.