If you have the stats that I mentioned in my post, then consider your self pretty much competitive at most of the ortho programs. I would do 3 one month rotations during your 4th year, the 1st one being at your home school, so that you can use that month to kinda figure things out, reading X rays, consults, what is expected of you, etc, etc, then do your aways around sept and october, those two months are closer to interview dates and you will have an lasting impression on the program if you rotate later, but not too late, as Nov and dec is too late. Also if you get down with one of your aways early, you might be able to get an letter for your apps. An strong Away letter looks very good, because you have showed people that you can impress your home people and the away people. If you are set on the Northwest, find two programs to rotate out there, set it up early, and find out which service is good and who is good to work with. Usually working with the PD or Chair will help you in the application process, so find out what services those guys are on, then set it up.
There is no such thing as a safe program in ortho.... well, maybe a couple of the crappy programs are easier to get into. Pick a couple of programs that you are very interested in going, then set up, kick ass on those months as in, show up early, stay late, help out, don't step on anyone shoes esp any of the resident's, work hard, read pertinant things, etc, etc. Ithink if you check out orthogate, there is many suggestions on what qualities you need to rock out the away rotations. Basically, DO NOT show up late for rounds, DO NOT make your resident look bad, DO NOT joke around with people that you don't know very well (I have seen several rotators that offended my fellow residents by telling inappropriate jokes... which is a big strike), DO NOT complain about how hard you are working, DO show interest at what you are doing, DO have a smile on your face, DO try to help out when ever possible, these things will help you.
Good luck with the roation and matching.