First, get a cab that will fit your storage needs, i.e. the biggest one you can afford.
All other things being equal, a cooled Aristocrat will provide a better, more stable environment for your sticks. One other thing to consider, and this is not to bash Bob Staebell at all, is that the THC system does have a relatively high failure rate (relative to his non cooled cabs). I know a few people who's cooling has failed and a couple have had repeated failures. Bob has excellent customer service, but a cabinet is a long term purchase and if it fails 10 years from now, your options may be limited. Of course, my opinion is based on a small number of failures. I have no idea what the failure rate is at say, 5 years, but it's well above zero. I have no doubt Bob can give you better info if you give him a call.