Hi GSAA
I applied for multiple visas,now it is upto the visa councillor to give 1yrto 10 year visa.It is totally his discretion as well his judgement.
If u apply for single entry they will issue u no more than 6 months.
This was my first application for Canadian embassy.I had about 17011 CAD in my savings account, letter of sponsership and PR card photostat from my brother in law(Sister's Husband)Had a travel history to Europe,Dubai,china,hongkong macau,a valid 10 year UK business visa expiring in 2015.
Never overstayed in any country for more than 6 months.I guess that made the difference......
All the best for ur visa....