I use Differin as a maintenance treatment after I got off of Accutane... It is WONDERFUL! It really doesn't dry out my face at all, and I think it is very gentle... I used Tazorac before I went on Accutane, and it didn't do anything, and it also seemed MUCH more intense...
If you are interested in Differin and your Dr Rx's it, PM me. I have a link to a drugstore for Canada that has it for cheap and without a Rx, so no worries about refills.
Since you are in Canada I don't know if the website I have would be cheaper thana drugstore near you, but it is worth a shot...
EDIT - I use it at night all over my face and I don't find it drying...