When I received my Gov't coupons, I decided to experiment between two different brands. I really wanted the Echostar TR-40, but those won't be available until this Summer at the earliest. There aren't that many different brands of STBs available at the market moment, even though the Gov't says all these different models meet their coupon program requirements. I ended up redeeming the coupons on a Bestbuy Insignia and a Radio Shack Digital Stream.
IMO, the Digital Stream has a better On Screen Guide, a more sensitive receiver and a more robust remote control. Both were very easy to setup, but if you want a recommendation, I personally recommend the Digital Stream model from RS - that is IF you can stand all of the stupid questions they ask you when you buy anything in a RS store. I hate going to RS just for that reason.
my 2 bits worth.......