mtbmtb01.
Please consider this combo pack,
URC RF20 + blaster, replete with emitter wires.
Midcow2 and strube have bought them on my rec. You can ask them q's too. The DID need the RF, like I did, but it's naturally IR/RF. You can use the blaster at another time, when you find it convenient, and simply use it as an IR remote.
Then again, the remote by itself is $50 or so. I highly recommend trying the RF function. After having it for the first time, I'm never going back, especially because it's so darn affordable.
I've used for a good while the Harmony 520. Looks just about identical to the 550. IMO, there is no comparison, the URC is the hands down winner. Even my tech-retard friends who aren't into HT hated my old remote, if they tried to use it.
It's more fool proof, easier to program, less time to program, easier to tweak, less time to tweak, bigger buttons, weighter solid feel, backlight is not automatically required during use, which itself is programmable between 1-99 seconds or something like that . . .
This is my opinion, and after you read around, I'm sure you will find the right choice.