I'm so glad your ds is moving through the Emerging Reader's Set, and I would think doing the last portion of Reading Made Easy would be a good idea. You could just tell him you realized you hadn't really done that with him before, and thought this would be an easy way of having him do this at a quicker pace and without him really having to write (he should love that if he's a typical boy

). I'd start him at the point in Reading Made Easy that he could do fairly easily, and then clip along for awhile, so he feels confident and sees that he's moving through the book more quickly than his younger sibling. Then, upon completing RME, I'd do a few ETC books, maybe 3 and 4, just letting him pick between 2-4 pages a day to do in order from them. We did that with my dc, and they liked being able to pick how much to do. They also thought the books were funny. If you are choosing between R & S and PLL, I'd go with R & S, as PLL will have many LA skills in it that are already covered beautifully within the context of history/science and CM style way of doing things in HOD's lesson plans. You may have heard this before, but in case not, a good portion of R & S can be done orally. Most ladies just leave about 1/3 for the child to actually write. After completing your Emerging Reader's Set and RME, your ds should be ready to begin Level 2/3 of DITHOR. We used the Level 2 book pack after finishing the Emerging Reader's Set, and found that to be a nice place to pick up after the emerging reader's books. You've gotten some good things to ponder here on this thread, and these are just ideas for you to consider too, as you will certainly know what seems to fit your ds the best. HTH!
In Christ,
Julie