4.55% is a good rate for 5 years. However, there are some fees may associte with the mortgage such as :
1) mortage application fee (most banks will not charge this)
2) CMHC application fee (if your down payment is less than 25% of the purchasing price, and you need to purchase the high ratio mortgage insurance; then there is a $125 application fee; however, there are many banks willing to pay for this fee)
3) CMHC high ratio mortgage insurance (this is the mortage insurance, the buyers need to pay this fee if their downpayment is less than 25% of the purchasing price, banks will not pay for this)
4) there are may be property appriasal fee, usually cost $200 to $300, and most banks will pay for this as well.
When doing the mortage shopping, you will need to take into the account of the fees mentioned aboved.
It really depends on your personal preferences, some people will choose the variable rate, and some choose the fixed rate. If you choose the variable rate, make sure there is an option for locking into a fixed rate mortage when rates are going up.