I would like to apologize to nhbeast, I re-read what I had written and it came across the complete opposite way than I meant it to. So I retract what I have said and replace it with:
Though I appreciate your thoughtful and helpful contributions, I find that the examples that you have posted for the Tamron 12-24mm lens not appealing enough for the kind of photography that interests me. Again, nothing against your photography at all (Lord knows that I am the one of the last people to make such a harsh comment like I did -- I'm just terrible at choosing my words), however as stated previously that lens in the examples provided do not appeal me enough to look more into.
On another note -
I do believe that I have decided on the Sigma 10-20. Though the thought of having a constant lens is extremely appealing, I do not see how a $200 (or more in some cases) price-tag is justified. I have had a lot of luck with Sigma in the past (albeit with a Nikon) and I would hope to run into the same sort of luck this time around. It also comes at a pricetag that is so appealing, that I'll still have enough in my budget left over to purchase a 430EX II Speedlight, and a remote later down the road.
I'd like to thank everyone who has contributed to this thread, I truly appreciate all of the comments and opinions expressed and feel really blessed to have such a welcoming forums such as this to get the advice I need whenever in doubt.