Well, where I am at now is that I am really enjoying the FX40s (with foam tips). They cost me approx $35CN. I could return them and get the FXD80's from our good friends buyfromjapan for $95 (because I can't really justify having both pairs). The question is, are the FXD80's worth the $60 premium? Keep in mind that I'm a guy that doesn't even like iem's (well, not since discovering the FX40 lol!). And to further complicate things, now we have rickdohc spouting off about liking the FXD70 more than the FXD80 lol! (then again, we all know that rick is crazy - he even thinks that the S500 is better than the almighty modded ksc75's!)
I think I paid closer to $130-$150 for them when they were released. I wholeheartedly believe it was worth every penny if not more. Not having any disrespect for any of the pricier iem's (W4R, EX1000) to name a couple. Those to me had flaws that didn't justify the price or sound to my ears. They sound very good but I don't hear any flaws in the FXD's when I pop them in. I really don't consider myself an audiophile or more likely I'm just not all that picky. But I've heard a lot of earphones and headphones to appreciate the few that I really enjoy. I don't think you could go wrong with either the 70 or 80 based on you enjoying the 40's. 70's are tighter, more precise sounding. 80's are just bigger sounding. Both very capable of bringing out details but adding just enough color to make the music more involving. It's obvious I like color and some warmth along with the details for my preferred sound signature. I think the UM Miracles can attest to that since it's my favorite sounding earphone that I own and have heard. Take it with a grain of salt since I know many will not prefer the sound that I enjoy. But to get back on point, I think the 80's are more of the 40's flavor than the 70's. Man, I'm being long winded tonight. My apologies. Hope you get one or the other and enjoy the heck out of them like I do.