I wasn't being snarky so hope you didn't take it that way.
Well, 'best' really depends on your criteria really. I assumed that any product listed in the OP came recommended here so clicked a few links and assessed the different options until I found a pair that I was happy with in terms of price, looks, angle of jack etc. I can't give you any clearer help than that I'm afraid as I'm not an audiophile; I just needed some new IEMs.
With regard to the sleeping on your side issue....me too. I bought these:
http://www.amazon.com/dp/B0038W0K1G/?tag=neogaf0e-20
purely for that purpose. The Amazon review mentioned that they were more comfortable than most when lying on one's side so I decided they were cheap enough to risk it. They are not entirely comfortable i.e. my ear can get a bit sore but it's not enough discomfort to stop me falling asleep or enough to wake me up or anything.
It's only be a few days of use with them so far and I've essentially slept through the night wearing them, occasionally waking up briefly to re-position them.
If I'm reading your post right you are considering those IEMs anyway. So might I suggest that you consider those as a cheap trial pair to see how you get on with IEMs, both in general and with regard to the sleeping issue? Then if you decide you wish to upgrade to a better quality pair you could leave these by the bed and use a better pair for your other needs. This is what I do. I have another pair [of still inexpensive, in the scheme of things] IEMs i.e. these:
http://mp4nation.net/catalog/brainwavz-m1-iem-earphones-p-399.html
which I use purely for my Nano and 3DS.
Hope that helps and I hope you settle on something that is just right for you
.