Michael - we've been seriously tracking with our standard sized smooth teckel (dachshund of European ie hunting, bloodlines) for 7 years. I've posted a lot.... and have answered your questions from my perspective a few times... search Oskar (our dog's name) on powwow or my posts on here and you'll get some info to read.
The main thing....get the dog that is right for YOU....just like a bow, one size does NOT fit all. You'll track with him 3 months a year and live with him for 12....get a breed YOU and YOUR family can live with.
Don't get bamboozled by the salesmanship.... the REAL experience is in Europe, blood tracking with dogs is nothing new or magic, there is a thousand year history of tracking over there, the average hunter there knows as much about it as most of the "experts" in the USA. Get a dog from proven bloodlines, with a good background of health history in the pedigree, with good prey drive and you are in business. I would disagree that there are specialized breeds beyond a couple from Europe that are extremely difficult to import into the US (for instance proven Bavarian bloodhounds), the European type dogs used in the US - generally teckels, whether smooth, wirehaired, or long haired, or German wirehaired pointers (Drahthaars) are generalists, not specialists.... but they are smart enough to know what you want and what to do at a given time.
Ted is exactly right that the key is learning your dog - the reality is the dog knows how to do this instinctually...he trains YOU - not the other way around. The teamwork is key - you can't just be a dope on a rope behind the dog.
John's book is a good primer, and a must have for someone getting started, but you also need to be sure you find a breeder with enough experience and "dogmanship" to support you in the training... the breeder should be the expert on their dogs and should be more than willing to spend the time with you that you need.
Be careful, too... blood tracking is a fad right now and I've heard of pet breeders selling "tracking dogs", if the breeder doesn't track that would be a red flag to me.
We love it, my wife is the primary handler, and Oskar has found right at 50 deer so far. He lives to hunt and track, and we've made some great friends in this hobby.... also have avoided some sleepless nights with marginal hits.
It is a bunch of work, and takes dedication, but can add a whole new dimension to your hunting. I owe it to my wife who is the dog person here..she developed Oskar to his current level. She handled him in JGHV VsWP (blood track testing sanctioned and judged by the German breed club - this is how these dogs are registered) testing a few years back (he was 3 or 4 yrs old) and achieved Prize 1 performance in both the 20 and 40 hour tests. As of then he was the only teckel in the United States to test to this level in sanctioned JGHV testing. There is dog potential in the States, just be sure you find the breed that will make YOU happy long term.
R