Kind of looking for a bit more information

Ie BUy a tivo model number XXXX with XXgig drive, and here is why ......

Ie Buy replytv model number xxxx with xx gig drive cause tivo sucks and here is why .....

Not sure what the Replay folks list as, but I don't think these devices are usually listed in figures of GB. It's usually how many hours of maximum recording time. 80 hours is the largest commercially available Tivo, but you can upgrade to insane amounts yourself (at least with Series 1 units)