Hi Kjorgen,
I have a couple of suggestions for you:
Nikon Coolpix P7000 and Fantasea FP7000 housing , click here to see the newbielink:http://wetpixel.com/i.php/full/review-nikon-coolpix-p7000-and-fantasea-fp7000-housing/ [nonactive]
Another Option is one I suggested to someone with a 2200$ budget, see below:
First of all , I would suggest getting a couple of strobes. With 2200$ , you will not be able to get a DSLR package and I believe that strobes make more of a difference that one camera or another.
Your budget should be enough for the Olympus Pen Micro 4/3rds cameras , housing and 2 strobes , maybe you will go a little bit over.
Amazing review of their previous model can be found on newbielink:http://www.backscatter.com/learn/article/article.php?ID=100 [nonactive]
Here are some links to get you going:
newbielink:http://www.housingcamera.com/Olympus-Pen-E-PL2-Underwater-Camera-p/ol-262905.htm [nonactive]
newbielink:http://www.housingcamera.com/BTS-Dual-Arm-and-Tray-package-Mid-p/bts-t-flex-pkg-3.htm [nonactive]
newbielink:http://www.housingcamera.com/Strobe-YS-01-p/ss-03112.htm [nonactive]
You will also need a couple of fiber optics cables.
If you want you can go for a Sea and Sea arm and tray set , they have a couple of options as well.
I think the Olympus Pen will give you the best results for your budget.
If you have any specific questions , PM or email me and you are welcome to ask more questions in this thread , I will do my best to recommend and there are many other professionals here which will for sure comment and recommend themselves.