Dude,
You ask a question, and you get answers. You may not like them, but to act irritated about the views of others is not a fitting reaction.
The issue you put to the table is whether it is 'justified' for a DM to refuse a certain item at the start of a game. The consensus answer is: yes, definately. You initially put it as though it was being taken away, which appears to be untrue.
Furthermore, you claim that 'other PC's can have similar things, no problem, my PC is singled out'. First of all, is this really true, or do they also have stuff refused?
Also, the question from the DM's point of view is (should be) a broader one. Do the other PC's, the thief and mage in your example, also have powerful templates AND powerful PrC AND powerful items geared to optimize the PC's? If so, then maybe your gripe is 'legitimate', otherwise, if I were your DM, all your complaints are whiffles in the wind and would result in a 'take it or find another game' type answer. It is perfectly valid for a DM to try to even the powerlevels of the various PC's, and we are talking about the submission of a PC, not about 'taking away' items your PC has had and earned over time.
My suggestion, following rule zero, is that if you feel the DM is singling you out, and you are not enjoying his style or way of handling his game, then bow out and tell the DM he needs to find another player... playing in a game whose DM's style you disagree with is a recipe for disaster and will only lead to more irritation along the way and lead to less enjoyment for yourself and the others involved.