Debating whether to use my last return flight to South America for Mileage Plus or to start an Aeroplan account.

I have about 11k on Mileage Plus that will expire in Jan 2012 if I don't have any account activity.

But I'm Canadian so I can't really use any of United's credit card offers or anything, whereas in Canada I can open up an Aeroplan visa.

1) What is your home airport? (SFO, LAX, MCO, etc.)
YYZ (Toronto)

(2) What types of fares do you usually buy ? (C, F, Y, etc.)
Y

(3) How many miles do you usually fly each year? (<25K, 25k-50k, >50k)
<25K.

(4) Do you have any kind of status at present? What is it? (UA Premier, M&M Senator etc)
No. Been with MileagePlus since I was a kid.

(5) What is most important to you in a FFP? (Frequent upgrades on travel, priority services when flying the airline, good award redemption rates, free lounge access, etc.)
good award redemption rates - since I likely won't reach any kind of status. Free lounge access would be nice.

(6) Which routes do you fly most often (US Domestic, Transpacific etc)
A flight to Hong Kong once every couple years plus one or two domestic flights (Canada to US).

(7) Preferred Airlines
AC and United

(8) Do you travel for work or pleasure? (Can you chooose your airlines, class of service?)
Pleasure