i don't know if i should try to add another HD to the TiVo or save me the trouble and just buy another unit. i have a DVR from DirecTV and i think it records up to 40 hours only and i'm thinking that since these DVRs are somewhat cheap on eBay, i might just buy another one. or, someone told me i can buy another TiVo DVR from like Best Buy for free basically because of the rebate so i'm thinking that could be the best option for me (although i don't know if the DVR rebate is still around). or, as a last resort, i *could* try adding another hard drive in there (although i've never done it before and i'm scared that i might mess it up and i'm gonna have to buy a new unit... and then another one as the second unit :/) help? suggestions? thanks, guys!