I use an aquarium water chiller and have found it works well for my needs. It is only 1500 BTU's but it kepps my mobile down to around 15 C overclocked to 222x12. I decided to use this over a TEC as I started thinking of my power bill. Got my first bill in the mail last week since running my chiller (hardwired to stay on all the time). I was pleased as my energy consumption was no more then it was at the same time last year. Although 15C is not the 0C I once dreamed of, I had to come to terms with other factors, such as noise and cash!
At the moment I am still planing on making a chiller that will go colder, but I think for long term use I will stick with my chiller as it is quiet and doesn't break the bank. I have an AC unit and a fridge that I am currently working on. Sadly, we have had such a nice summer here in the PNW, that I have been using the AC unit to keep the Appt. cool. The fridge on the other hand is being gutted as we speek.