Good point. One issue: no I'm not earning money out of it, and it means I will not get a single cent out of it too. Seems like most of you guys are pro-aperture in here then. I understand most people stated that Canon's speed is good, but does the Tamron lag behind much? How big is the difference? Seems like you guys are saying the speed is worth twice the price? It will be used mainly indoors I believe, hence it seems like I'm more of going for the Tamron for now. Definitely will use it outdoors at times, but the fact that I'm a hobbyist means that there's a good chunk of it being indoors.
I think you know what your choice will be: Tamron. Stick with your budget, and you'll sleep better. There is no point in extending yourself financially for a hobby, but before you buy, drop by a store and try both. See if the Tamron satisfies your requirements, and if the price difference is worth saving the extra funds.