Progressive scan player or HDTV? (Score 1)

Hello, I'm looking into buying a DVD player, and I'm wondering if it really makes sense to spend the extra money to buy a progressive scan player (I have a non-HD tv, so I won't see a difference) and be "ready" for when I can afford a HDTV, or if the "line doubler" or whatever the name is of the HDTV will give me the same results, with a conventional DVD player. What do you think? Thanks!