FWIW, I got a single Hopper installed to replace my 722. It was impossible to do this online or even through DIRT, but I was able to do it by simply calling a local installer.
While I've used modulators in the past, and they worked fine, I wanted HD, so I picked up a wireless HDMI system, which worked very well. I used the modulator to share my Hopper with 3 other SD TVs and my wireless HDMI to share it with 2 other HD TVs. I stopped using the modulator when I eventually upgraded all those old sets to HD. If I were buying today, I'd use Moca instead.
BTW, all my modulators came from ebay or walmart and were under $10.
Also realize that this isn't going to work like your old 622 or 722 where you have an independent TV2. With a Hopper and no joeys, all TVs are going to have to watch exactly the same thing. Something to keep in mind.
All TVs watching the same thing is not a problem; we used the 622 in single mode because we're one of those strange couples that watch the same thing at the same time (even if one of us is in another room).
What wireless hdmi system did you use? That sounds like another option to consider.