All you need is the 3 LNB dish you have now. Seeing you are in LA, you should get ABC, NBC, CBS, and Fox via the dish in the 80 range. If you want any other local channels in your area, they would require an OTA antenna.
When the new MPEG4 capable DVR comes out you can upgrade to it and the 5 LNB dish, Directv should move the LA channels over to the new sats and start transmitting them in MPEG4 at some point and they should start picking up other local LA channels besides the big 4 in the future and you'll need the new equipment to get all of them.
Word of advice, when dealing with Directv CSR's, if it sounds too good to be true, it usually is.
When the new MPEG4 capable DVR comes out you can upgrade to it and the 5 LNB dish, Directv should move the LA channels over to the new sats and start transmitting them in MPEG4 at some point and they should start picking up other local LA channels besides the big 4 in the future and you'll need the new equipment to get all of them.
Word of advice, when dealing with Directv CSR's, if it sounds too good to be true, it usually is.
