Well this was definitely enlightening, thanks @David Krulac and @Steve Babiak and everyone else for your insights.
I want to restate the process so that I am clear in my own mind about the process, the potential hurdles involved, and
1. The list is released for my county in PA for an upset sale. I should identify the properties I would be interested in purchasing. I would then do a physical inspection of the property to the fullest extent possible.
2. Of the properties that remain, I would perform a title search on them to identify any other liens or judgments that may be present. What does a title company charge to perform these searches and what is the turnaround? Suppose I found mortgages or a federal tax lien on the property, is this a deal killer? Does it just depend on the particular properties value less the payoff?
Let's say I acquire a property for a $5,000 tax payoff and there is a $50,000 mortgage, but the property is worth $100,000. When do I have to pay off the mortgage, when I acquire it on at the tax sale or when I sell the property?
3. I now have a list of properties that I want to buy, appear to be in good physical condition, and I have full knowledge of the potential title issues that could exist.
4. I go to the tax sale in September. Do I have to pay the full amount of the tax lien? David mentioned different states perform the auctions in different ways, how does PA do it? Specifically Cambria county?
5. I purchase one tax lien. Do I immediately receive the tax deed and I am the owner of the property? If I do not receive the deed immediately, can I still begin to evict/deal with the occupants?
What needs to be done with the deed to make sure that it is transferable to a buyer who may get a mortgage on the property?
I'm sure more questions will come up, but thanks for all of the help!