A scanner is the cheapest and best purchase a spotter can make. You will want to program buttons for ATIS, the tower and approach frequencies. With gas prices today it only takes being at the wrong end a few times to make up the cost of the scanner.
Most airports and air spaces have a "light and variable winds" runway(s) which are used in wind conditions under 8 or 12 kts. The airport charts should tell you that information - or a section on the airport web site for GA
Turning an airport like CYYZ is a complex task which isn't done with every little wind shift. But with an hour drive to the airport, it can be turned from when you check the internet before you arrive. You really need a scanner.