Is it worth it

I have a tivo premiere xl 2 tuner w/lifetime. I also have fios quantum which consists of 2 dvr's 4 satalite boxes and 1 cable card. I pay $159.99 for triple play plus $32 for quantum service $45.99 for boxes and $4.99 for cable card. I get a $22 credit for 2 year agreement. To go all tivo I need a romio plus 4 mini's and 1 cable card.I have tivo since 2002 so I think I can get a romio for $499 w/lifetime. 4 mini's at $249 each. Is this correct? Can I do better? In my current tivo I can record 150 hrs. Is the romio plus the same size? how much more do I get with a 3tb HD. One more thing If I record a program downstairs with the romio,can 2 people upstairs watch the same program starting 30 minutes apart? thanks ,Gary