The decision has been made

I will try to learn Cantonese rather than Mandarin. Despite the fact that everyone tells me to learn mandarin for various sensible reasons including: it only has four tones instead of nine(therefore much much easier), and is spoken by more people in more places. Even the Australasian Centre of Chinese Studies states 'In general, we recommend you learn Mandarin unless you have a very specific reason to learn Cantonese. '

What's my specific reason?

because i'm nosey, basically i want to understand all of Toby's conversations (without him having to translate for me).

Anyone know where else apart form ACCS to learn Cantonese at a beginner level at a low cost?