Well, I think that out of these three the RE0 have the best sound quality, probably followed by the Shures. The RE0 are very precision and detail oriented, just like the other two of the line. If this is something you like in an iem, then both the RE2 and 0 are extremely good value for the money, and I am assuming it fits your sound signature taste since you suggested it. The RE2 is a little lighter on the bass, and somewhat ER6i-like in sound signature (not in quality though), while the RE0 has got a little more bass kick, and is kind of right in the middle as far as sound signature goes. I wouldn't recommend the RE1 for you since even though you plan on getting the E5, it is still quite a low-end amp, so they would probably not meet their full potential. I would not get them unless you plan on upgrading your amp any time soon.
Even though you would not be able to directly compare a less well known phone as well as say a shure or ety phone to future phones, you can always use a similar phone for comparison purposes. Also, to me with my limited budget, it is not worth it to blow $100 on some ****ty phone like the shure SE110 when you could get an RE2 with a similar sound signature and not want to upgrade a month later because the Shures suck just so that in the future I can get slightly better recommendations when I would probably be able to figure out what I needed on my own.
"But for some new guy, they'll go off thinking these Mylars are so uber amazing, when they haven't even heard an IEM staple sound from the big 4."
Well, for one thing, for $55 bucks the Mylars are pretty much "uber amazing" in sound quality at least, its just the build quality that sucks, and thats why no one talks about them any more. And I'm sure that new guys won't go around thinking that that kind of build quality is standard in an iem; if he got the recommendation off head-fi in the first place, then i'm pretty sure that he's gonna go back on and read all of the reviews talking about that problem.
Anyways, sorry for the angry sounding debate
and I guess we'll have to agree to disagree on this one. Maybe I'm just crazy since I know that yours is the general opinion held by a lot of headfiers