Just for Canadian readers (although I think there may be a few Timmy's in the US now too) -- if you love both coffee AND hot chocolate, you'll want to try a Cafe Mocha. It's basically half of each topped with whipped topping and a healthy dose of chocolate shavings. I think a medium is about $1.39 -- a lot cheaper than a pricey starbucks creation!
Of course, you could also make this at home -- just half coffee and half hot chocolate with whipped cream on top. YUMMMMMMM