I'd go with HRV, I have no problems even with Manitoba winters, though my tank isn't exactly large - I top off a bit over 5 gallons a week if that gives you some idea. Our HRV also serves as an extractor for the bathrooms too, and we have fresh air in the house all year round.
One point to note is that HRVs and ERVs are different, and what you need depends on your climate, if I remember correctly ERVs are like an HRV, but they actually put some of the moisture from the moist stale air back into the dryer fresh incoming air. In areas where one would be running A/C most of the time this offsets its drying effect on the inside air. Most homes here have an HRV rather than an ERV.
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