Just found this thread again... couple points/recommendations from me. I can attest to there being something "extra" in Tim's Coffee... I found that I was getting massive headaches on the weekend, even when I picked up McDonald's coffee on saturday/sunday's (which I prefer, but did not have access to during the week)... Once I stopped having timmy's during the week, and just drank normal instant, or any other chain's coffee, the headaches disappeared.
Very strange.
I actually like McDonald's coffee quite a bit, people laugh when I tell them how good it is now, but they really did improve it a lot.
Starbucks is the closest to my building downtown, and although its my least favourite of the chains, their Toffee Nut Latte is actually quite good.
Second Cup, as mentioned previously in this thread, is very hit and miss... Some places it'll be FANTASTIC, others it is worse than Starbucks. I VASTLY prefer their Vanilla Latte to the Starbucks version though... Especially if made at one of the "good" locations. Mike @ Second Cup in McKenzie makes the best i've had btw... In fact their whole staff is really good.
Downtown, I recommend the Nutella Latte from Deville... Friggin' delicious, especially if you like Nutella