As low as possible?
http://www.crutchfieldcanada.com/Pro...ode=647LVM42W2
Not sure how much lower you can get for 1080p... and a # of people have had good experiences with that TV on the avsforums.
http://www.bestbuy.ca/catalog/prodde...31&catid=24558
If you want more mainstream brand, though I don't know anything about that TV (800:1 contrast ratio is a bit low).
EDIT: Any particular reason for needing 1080p? Xbox 360 / PS3? Otherwise you won't notice a difference from 720p, unless you go huge TV and HD DVD or Bluray movies.