If I had it to do over again, knowing what I do now, I would have waited until after the first of the year to get my CECBs...there are bugs in the ones that I own that are still being worked out and may not ever get resolved, but the odds go up the longer you wait. Plus there are new/updated models that will be coming out late this year early next which might have features that the current ones dont. The Zenith is definately one of the better all around boxes out there (cant speak as highly for the CM-7000, as I've had a slew of issues with mine) and if they should decide to add something like S-video to it, that would probably make it the best box out there.
Also be aware that if you get a CECB with the coupon and you end up not liking it, you're restricted to exchanges within the retailer you bought it from, and you're out of a coupon if they'll somehow let you return it. Additionally, while you might save money by buying online, you might save pulling out your hair by buying locally if something should end up being wrong with your CECB. No shipping back and forth.
Just my 2 cents.