I am in Tampa and have been using an Igloo ice cube like this one for like 4 years now and it works great for me:
http://www.google.com/products/catalog?q=igloo+ice+cube&hl=en&prmd=imvns&bav=on.2 ,or.r_gc.r_pw.,cf.osb&biw=1366&bih=667&um=1&ie=UTF-8&tbm=shop&cid=10432546163331145459&sa=X&ei=ad4xT9 G1OMHf0QH4mq3ABw&ved=0CHgQ8wIwAA
Full of water with a couple ice bottles a day I can maintain a steady temp no sweat...52'F for lagers is as far low as I can push it as far as primary goes, but it is not as big a hassle as some make it out to be.
Before I started kegging I cut a hole in the lid so I could close it with a 5 gallon secondary in it, which allowed me to lager around 40'F. After 3-4 weeks of that it did become a bit of a hassle.
Honestly you only need to maintain temp on an ale for the first couple days, after that just let it warm up to the low 70's and it'll be fine. The water bath insulates it from fluctuations which is a plus.
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