As an owner of a REL S5 SHO I think REL's are amazing subs for 2 channel. Just make sure you match the right REL to your Totems. If your Totems go down to 28 hz as another member posted here, then you probably need to go up the REL ladder a bit. At least to a 510SE or maybe the 812SE. The REL website has a tool that helps you match the right REL to your speakers.
Good luck and be sure to post your thoughts once you make the purchase! :)
Good luck and be sure to post your thoughts once you make the purchase! :)