Which would you buy? Roamio Plus all in or Tivo Bolt?

Hi All,

I have tried searching for this topic but didn't find the exact scenario. I would like to buy a new or used tivo and here are my options below. Which would you choose? The Roamio is quite expensive, but it has the all in subscription & more tuners.

Also, for the steaming, does that work only in the same network or can you steam from anywhere? Is it a good option to have in your opinion or is it rarely used?

Used Tivo Roamio Plus:Approx $650 - $700
-6 tuners (not sure if I need 6)
-Built in steaming
-1tb hard drive
-ALL IN subscription included

-or-

Brand New Tivo Bolt 500MB: $169 + $150/year subscription
-4 tuners
-Built in steaming
-500mb Hard drive
-Buy the annual subscription

-or-

Used Roamio HD: $450 All in subscription included
-4 tuners
-NO built in steaming
-500mb hard drive
-ALL IN subscription included

Thanks in advance!