Thinking about retrofitting my headlights, is this the right kit?

That's a lot of work and downtime to do the retrofit. I wonder if something like this might work out for you:

http://pages.ebay.com/link/?nav=item.view&id=221504691710&alt=web

I don't know how it does the highbeam though.

Very little downtime for your vehicle versus the retrofit route. Though the retrofit will definitely produce superior results if done properly.

 

This is the exact kit I bought for my retrofit, but I got the 5500k instead of the 4500k, and unlike you, I messed up and bought the wrong harness, which is why I'm currently on hold waiting for the new/correct one.
I did not do a step by step this time because I had already done one for my 4Runner, if you like you can take a look at that, it's pretty much the same, (for the most part) just different assembly, and you will NOT have to dremel anything out.

my 03-05 retrofit - Toyota 4Runner Forum - Largest 4Runner Forum

For the Prius is is much easier since it's literally a bolt on kit, perfect for it. On my 4Runner I had to dremel and grind my reflectors in order to make them work. But like I said, that is not the case with the Prius, just pull the shield out and insert the new projectors in.
Anyways, the main thing is to take your time opening your headlights, don't just go beast mode and yank on them. Pick a corner, pry with a flat head and pull slowly and hold, then pull slowly again and hold, as you pull the rubber sealant will stretch and give way. I baked mine for 7 minutes in 265 degrees. Remove all the screws prior to baking of course. I will post more pics later if you like, but in the meantime, you can look at it in this thread:

What Did You Do To Your Gen II Today? | Page 5 | PriusChat

 

Nope, you did good..... unlike me

 

The Halos in my Prius are actually Poxy'ed, no wires like in the 4Runner. I used JB kwik, it's more than enough. and I used heatshrink to cover the wires. I'll post pics later tonight.

 

As you can see, it's really not that hard, just take your time. As you can see, the H1 mini reflectors will fit right in. Few things off top of my head now:

Before you put everything back together and you seal it:
1. Do not tight the H1 mini reflector nut super tight, just hand tight it first. Install the headlights on the vehicles and make sure your reflectors are aligned in a straight line, you will have to rotate clockwise or counter to get the line (cut off) straight, while trying to get your beams aim in the general area/spot, not perfect, but you want to make sure it's no completely out of whack either. Then tight it down, these are crush thread, so once you tight them down all the way, that's it, no going back. You can aim the beam to perfection afterwards with the elevation and side to side adjustment screws of course.
2. Before you seal it down, give it a good clean. Wipe down all that dust and fingerprints/oils off of the lenses.
3. Don't tape the Halos wired to the H1 mini reflectors like I did with my 4Runner, it is dumb and it may only cause problems with overheating the wires. Yes these are HIDs, but they still create heat, and taping wires to a hot metal reflectors it's not a good idea.

That is all I can really think aside from my 4runner thread and the rest, it is really not hard, it just takes patience. Just take your time, do a little at the time. Maybe the others can chime in, but once you start, everything will fall in place. Good luck!

 

What did you wire your halos and demon eyes to? Either tap the parking lights, or tap a fuse in the engine compartment fuse box that's hot when in Ready mode.