@$90+tax, I'd prefer doing a weekend day at DDT or TMP, seems like you'd get more track time for roughly the same money.
Sunday June 23rd @ Mosport DDT 12:30 pm - 5 pm for $99 prepaid or $130 day of.
They have TMP Days also.
ATTS also has some lapping days for only $75 prepaid.
Sunday August 4, 2013 8:00am - 5:00pm
There is also an ATTS day on July 7th at DDT, don't have the info up yet.
Then there is always Bimmercruise Autoslalom and lapping Aug. 25th.