It's more whether your HDTV can accept a 1080p signal. If it can't, your HDTV will downscale the signal to 1080i.
Sorry Wolfshadw, I am not trying to be some sort of spelling/grammar police but your reply did not read well and was confusing a little so I edited with bold.
@Bochamp - I have a 720P/1080i Pioneer plasma that downscales 1080P bluray to 720p/1080i and looks great. Your tv should do the same, no problem