If you want to go for champagne, the Pol Roger or the Moet&Chandon, both around 55-60 CND are sure bets. Both are among the dryer products and are classics.
In Quebec, there are also several good French sparkling wines (vins mousseux) available at the larger liquor stores (SAQ) which in my view could pass for champagne even with a conoisseur (albeit blindfolded). You could consider for example the "Crémant de Bourgogne" by Cave de Viré (Product code 00735886), my personal favourite. There's also the Chateau Moncontour, more widely availaible but a bit sweeter. At less than half the price of real champagne, these are worth considering unless you need to impress with a label marked "Champagne".
Cheers!
JB
PS: An anecdote...On a recent date with an SP in Toronto, I had purchased and brought with me a bottle of real champagne, which unfortunately I had not had the opportunity to previously chill. Upon arriving at her place (she was a high-end incall), she offered to exchange my bottle with another she had in reserve in her fridge. I agreed and she pulled out a bottle of that Henkell Troken stuff (around 14$) as if it were equivalent. I initially felt a bit cheated but I can tell you, once the action started, I couldn't care less anymore. Goes to say...don't worry too much about the issue.