Balance
Not really. DVDs produce 852 x 480 resolution while both 1080i and 1080p do 1920 by 1080 (though one is interlaced and the other is progressive).
Even with "up-converting" you are liable not to take any advantage of the increased throughput.
However, if you think you will be getting the latest Blu-Ray or HD-DVDs to use, this will eventually bring in 1080p content. What you need to balance is whether or not it is worth buying a set that can produce 1080p resolution when there is no content yet for it. Also, I don't think the HDMI spec for 1080p has been ratified yet so even if you have a 1080p set now, you may have to do a firmware update later on to be able to actually "get" 1080p on your 1080p set (most sets now don't even allow you that).