You would have to REALLY want a 922 to lay out 750 clams for one. That is steep, IMO. A DCII sub is very nice to have, and there are ITC broadcast available I've only begin to piddle with, but keep in mind it is not new tech, (slow, cumbersome guide, etc) nor does it natively support HD, or PVR functions if those are feature you are seeking.
I'm not really trying to discourage you, just pointing out the value at a $750 price tag. I payed more for my 922 than I wanted to, but I wanted it so I bit the bullet and got it. Lots of other 4Ders here got good deals via Fleabay. If you are good with that, then that is a good place to start. Do you have a craigslist or similar type of marketing venue in your locale? Another place to check if so.
I dont know what if any restrictions you will encounter, but if it is a C band DCII sub you are interested in, Skyvision has a DCII sub service using a re-furb'd DSR410 for a reasonable price. You may be able to sub it 'stateside' if you have friends/ relatives that can provide you with an addy.
AFAIK the ITC DCII channels are not available to this setup, but be sure to get someone that has one to verify that. Also, all the tp's for this service are on W5, so a fixed C band dish pointed to 105W will get you everything subbable. Mike Kohl, a member here is a reseller for the setup via Skyvision as well. Google his name for more info.
There are members far better qualified to comment on the use of commercial DCII equipment for ITC DCII but I thought I'd mention that possibility too, since you expressed an interest in the 'open' DCII stuff.
Good luck, and hopefully you will soon be a member of the DCII club.
Long live C band!