I can suggest Riwoche as well (only downside is some of the programs can be quite expensive).
There is also Karma Sonam Dhargye Ling which is an excellent Karma Kagyu Centre (ksdl.org)
If your heart is with the Gelug tradition, I can recommend Manjushri Centre on Burnhamthorpe Road in Etobicoke, http://www.sklojam.com/blog/ai1ec_event ... ance_id=45
which is the centre of my master.
If you decide to visit Manjushri, I will be there often on weekends during most of July and part of August, along with the Geshe I translate for here in Europe. You can PM for a schedule of the centre if you like. All the teachings and initiations at this centre are on a donation basis, they do not charge for anything, which makes it quite unique. Khensur Rinpoche is one of the senior masters of the Gelug tradition, and has the distinction of being the longest serving abbot in exile chosen by HH Dalai Lama.