I'm looking for an inexpensive, but reliable reg for my pony bottle. I know the conshelf XIV is an old classic favorite, but the SE2 is also highly regarded as a simple reliable workhorse and also a newer design. But, brand new price of a XIV is way more than an SE2. So, picking up a used unit on eBay for approx $100, which would be the better reg to get ? I'm guessing the conshelf XIV, but it would likely be much older than an equally priced SE2.