@bullandre
I really don't think going for a degree in tax will limit you to only working in tax. Many people go for a master's degree, and a person could have chosen a tax program the same way s/he could have chosen marketing, statistics, accounting, etc. That's just the degree you choose to help you get to the 150 hour requirement. If you decide to work in tax, the degree should help you. If you want to work in audit, the degree should not hinder your opportunities. In fact, (this is just what I think, I've never worked in auditing) it may be help you as an auditor to still have some knowledge or backround in tax.
I don't see why having a certain degree should restrict you. There is no M.S. in Auditing (as far as I know), and it's not like the way things are is that if you work in tax, you get an M.S. in Tax, and if you work in audit you get an M.S. in Audit and if you work in regular accounting you get an M.S. in Accounting.
Many people don't have a master's degree and work in tax or audit. If you have a master's degree (or MBA), it can be beneficial. I don't see why it should restrict you.