My advice is go to Titantv.com and you can get a listing of what's on Comcast in your area if you have a printer hooked up to your computer print the listings and you're good to go.[the DTA does what the CSR says it does btw]
The $8.99 gets you access to the HD channels you'd get with whatever HD package you choose.....the cablecard will afaik get you the sports packages but check with the local office just to be sure.