My best Aeroplan redemption, back in the 'good old days', was finding a pair of J seats to New Zealand in high season.

YYZ-LAX-AKL - Open Jaw for 3.5 weeks - WEL-SYD - Stopover for 2 weeks - SYD-SFO-YYZ. All legs in J. And because it was mostly NZ and UA, the total fees and taxes we had to pay were only $31.50 each. I can't recall the exact mileage, and the confirmation e-mail I still have doesn't give the mileage, but it was something like 110k or 120k miles each at the time.