well I think you answered your own question.... only one of the projectors you mentionned is 720P native panel resolution.... the HT1000 is 1024 X 768 4:3, the 5700 is 1024 X 576 Matterhorn
Under 4K new, you aren't going to find a HD2 projector. You can get close with the Toshiba 7200 clone and the BenQ 8700. But your choices are limited because the prices aren't there yet..... now if you want 720P and can live with LCD, then there are plenty of choices...
the 5700 is stupendous if you are mainly focused on DVD... it does HDTV quite well, but the 7200 is definitely better. The difference in resolution is apparent there. If you are playing DVD on both of them, you'd be hard pressed to tell the difference between the two.
The HT1000 is a great projector, especially if you do any computer gaming or general desktop computing because of its 4:3 aspect ratio. Great picture quality and price is very good. the plus with this is that you can use an anamorphic lens to use more of the panel for DVD and high def viewing.