HD cable box

I currently have a Sony 60" rear projection LCD. I am adding a computer PVR with Hauppauge 250MCE and 150PVI. I currently have a Pace DC550P high definition box and want to get a second cable box. I have digital TV. Can I just go ahead and get a second HD Pace box?.. they are the same price as a regular digital, but seem a little sturdier and better built. Will the cable signal (to record) be the same quality as the non-HD digital box? thanks for any responses