I've owned the ety's (I tried custom molds for hure E2's; it resulted in poorer sound quality, so I never tried custom molds for the ety's) and the UE10PRO's--I would STRONGLY recommend going for the UE10's. I was an ety lover (actually still am), but the UE10's are just so much better all around. The bass is amazing, the mids are just right, and the highs (the strength of the ety's) are even clearer, with none of the brightness and harshness you can get with the ety's (especially at higher volumes). If you love the ety's, the UE10's are IMHO the perfect choice for you. They're much, much more than "ety's with bass"--they improve on every aspect of the ety's, and although the sound signature is different, it's close enough that it's an easy adjustment; it's a comfortable fit (I had my ety's for awhile before switching to the UE10's--I tried the UE5C's first, and just couldn't readjust to they're totally different sound signature--way too bass heavy for my tastes. It doesn't look like you're considering the UE5C's, which, coming from ety's, is good. If it's a money issue, I'd definitely go with the earmolds for the ety's, for example, over the UE5C's, but if it's not a money issue, personally I'd recommend going for the UE10's).
As much as I loved my ety's, they're gathering dust now. The UE10's for the very first time have halted my upgraditis--they're so good (for me) I've hit the point where I really don't feel the need for something better. I'll stick with these until they die.