Depends on how you want to do the National Parks along the way

If you are not member of CAA, suggest you join, and get all their maps.

Also get the Mountain Guides from Park Canada. The guide gives you very detailed information regarding the National Parks of Canadian Rockies - it would help you a lot to determine how much time to spend at each spot (based on what you want to do according to the info provided.) The Mountain Guide can be downloaded as PDF file (lots of color though) or ask it to be mailed to you. (if it is still possible to arrive before your trip.)

http://www.pc.gc.ca/docs/v-g/pm-mp/guidem-mguide/index_E.asp

Since you have 2 weeks to do this, you certainly have the luxury to leisurely enjoy the trip, including make some sideway trips off the beaten path. (I assume you are doing it one-way, not roundtrip.)

I recommend you to make your first stop around Rovelstoke NP. It is often overlooked by folks going from Vancouver to The Rockies. Or, you can make Kelowna / Kamloop your pit stop.