True, DD-WRT is a very viable (although a potentially more complicated) option.
As I read it, the OP was already connected by some means and was wondering if they should change their setup. If it's working well, there's no reason to change. The one thing I can't figure out is why there is so much resistance to adapter Dish is selling. There are good reasons to use another method, but if you just want to hook up one device, cheaply and easily, it's hard to beat.
My main problems are range, and wireless bandwidth.
When streaming in house this thing EATS bandwidth... 8 to 9 megs continuosly. This slows down other wireless devices I have ... so I went with a DD-WRT solution ... in fact ... I found NewEgg had Buffalo's 300N (8 meg flash, 32 meg ram) for 40 bucks.. buy two ... and I now have a completely seperate wireless network for my "adapter" devices... the PC's now go to the house wireless for internet access, all other wireless devices connect to the 2nd wireless router (first Buffalo 300N) and then through cat5 to the gateway, while at the far side of the house, I have the 722k, my Bluray, my Onkyo NR808 receiver, and an ethernet drop for a wired PC at that end..
while I spent 80 for this solution ... it really cleaned up network access, and when it comes to inhouse use of the 722k/Sling ... it made that traffic even more accessible and less congesitive .. I can now watch on my laptop with wireless ... where as before I would get stuttering for all the traffic going on..
Its a simple economics of scale .. if you'll only ever just hook up the dish receiver with wireless.. then sure.. go that route.. but when you run into network congestion ... you'll be back bitchy that things are not working well.. or when you add up the adapter for your other DLNA devices ... or upgrade your TV ... then what? ... the listed price originally for a wireless adapter on my bluray was 65 freakin' dollars.. Sixty f**kin' Five! Irritation of that kind of WASTE for *one* single solution.. ick.
And I should also note.. that NewEgg was also selling TrendNet's N based TEW-647GA (Game Adapter) for 24.99 ... so that device attached in an N network with a 5 port el cheapo switch also allows multiple devices, and the installation of that ... damned near idiot proof..
.... added to my 80 dollars.. that made 104 bucks invested to network 8 devices onto a seperate wireless network away from the PC ... or 13 dollars per device ... that's a pretty good deal!