I've been eying a chest freezer at lowe's and started looking at the temperature control units at the different brew stores. i'm trying to do this somewhat econmicaly but was wondering if there was a big difference in durability and performance between the less expensive units like the johnson control and the digital units that run $100 +. keeping a freezer warm really isn't that important to me since i live in texas and the temperature drops below frezzing maybe 10 days out of the year (the great 4 day ice storm of '07 closed down like half the state). also, are there any cheaper oprions out there? my lhbs has the johnson for $70 and i saw northern brewer has them for $52. any feedback is appreciated.