1000-1500 is on top of hotel expenses - you will most likely pay in advance for your hotel. You will need an employment letter which clearly states you are being granted leave for xx weeks to visit canada and other things as I mentioned above- your travel history seems fine to me. 5-6 lakhs seem ok again not ideal but pretty sufficient - it all depends how long you wish to stay in canada.(you gotta consider the cheapest airfare out of pakistan for canada is close to a lakh + Living expenses(hotels etc) + food/misc/shopping/travelling expenses - you gotta do your homework and figure out the expenses you might incur...you might end up spending 3+ lakhs easy on a 15-20 day trip you know.
Also you will have to write a letter explaining the purpose of your trip, why you want to visit canada where you will be staying which places you will visit etc ..It should be a detailed, well written, well explained letter which describes the intention of your visit, also your current occupation and why it will be important for you to return after your trip to Canada.
Again, like I said Canada is not a very tourist friendly country. They might welcome people from alot of other countries but people from third world countries usually visit Canada either to meet family/relatives or to study there or they immigrate. Again, I am not trying to discourage you thats what I have found out over there. I have myself applied for a TRV last week on Feb 20th...lets see what happens...