Question regarding currency trading

[shipitkthx]

I'm a noob when it comes to currency trading although I've been able to take advantage of the CAD/USA market on a small scale for the past few months. By small scale I'm referring to simply what funds I keep my bankroll in. I live very close to the Niagara Falls border and have family in the United States so I tend to make most of my purchases in the US. I have the ability through multiple bank accounts to keep my bankroll in either CAD, USD or a mixture of both. For most of 2007 I've been keeping all that I can in CAD accounts. This has been pretty profitable considering the huge drop of the USD vs. CAD so far. Looking at long term trends tho I am starting to wonder how much lower it can go. My recent check on the rate puts the market at around 1.0575. Can anyone with experience in these markets give me any tips on how low its forecasted to go? At what point should I start looking to keep my funds in USD again? Like i said this is really small scale but any advice would be appreciated.