Why do you want a swim8? If you don't have more than 9 tuners there's no reason for one. And if you ever did go over, DIRECTV would switch the lnb for a swim16 at the time it was actually needed. Keeping the two DVRs is the way to go if your adding a genie and get a swim16.
Swapping lnbs is pretty easy these days, and they will swap your dish most likely.
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In the long run, I may end up with a Genie and an HR10-250 which is 7 tuners. Otherwise I would also keep one of the HR21s and would end up with 9 tuners.
There are two reasons I want swim8 or 16.
1. I still have a HR10-250 that my wife loves mainly to record OTA in HD, and I need the Legacy ports on the swim8 or 16 to get guide data.
2. I own an Acutrac 22 MKII Pro and like to align my own satellite dish. I do a lot better job than any D* tech that has done it in the past. The Acutrac 22 won't work on a SWM lnb without purchasing an ASL and a power inserter which I don't want to purchase.
I don't mind swapping the SL5 lnb for the SL3 lnb, if my HR10-250 will still be able to get the guide data. According to the following post by texasbrit, I think it should work:
Unless you have an SWM system, you can't set the receiver to a 3LNB setting if you have a 5LNB dish (even if it is the AT9 and you remove the 110/119 sidecar). The reason is that only the SL3 (or an SWM setup) gets the guide from 101 all the time. If you have a 5LNB dish the guide comes from 119 if you tune a channel from 103. It's just the way the DirecTv stack plan works. Because the SL3 does not see 119, it's electrically different and it puts the 101 guide onto the 103 outputs, the receiver thinks it is coming from 119