Are you able to use an antenna with the HR10-250? If so, you will probably be able to use the HR10-250 to Tivo all the HD local network shows. I have had the HR10-250 for almost 2 years now, and do not subscribe to the HD pack, so I only watch HD from OTA. I have found that most of the season passes I have (about 75%) are from my OTA stations. The SD material looks OK, but I don't know if it would be that much better than from your Series 1 unit. I think a big part of how good SD looks depends on two things - quality of your TV, and proper settings like "picture/contrast" and "sharpness" controls.
I know I will eventually need to switch to the HR20, but I am holding out for now, since the HR10-250 works so well with OTA stations for me. If you don't want/need the other satellite dish, this might be a good temporary fix for you.