Sadly, you have no choice. Adding a new receiver will almost certainly come with a two year commitment.
If it were me, I'd go with the genie, which, apart from the commitment, could be free if you get the right CSR! The only added cost would be $3 for whole-home service and, not only would that setup allow you to record up to seven things at once (five on the HR34/44 and two on the HR20), but also watch whatever is recorded on either DVR on the other one.
The other option is to get the THR22, which has the TiVo logo and software, but does not have whole home and other features, but will cost $5/Mo more.
"YOU! YES YOU! STAND STILL, LADDIE"
"How can you have any pudding if you don't eat your meat?"