I'd just like to add that Rogers owns Fido, and also Rogers has thrown up a whole whack of new towers so coverage should be better, plus they will be the first to make 3G as they use GSM/HSDPA technology whereas Bell and Telus use CDMA technology. The benefits of GSM and HSDPA are the sim card (can use any phone you want that supports a sim card), and if you get a smartphone, data rates for HSDPA are 3.6mbps/84kbps (and higher). You can also get pcmcia/expresscards that support HSDPA for true broadband wireless with your laptop. I dont know what the rates are though.
HowardForums.com is a good place to check out mobile phone and provider reviews.
p.s. dont get amp'd mobile, they filed chapter 11.