I wanted to get peoples opinion on witch of KZs ED line has the most bass response it does not matter to me if it drowns out the mids and highs a little
So I have the ED3, ED4, ED9, EDSE, EDR1, and EDR2.
The only (readily available) one out of the ED line I don't have is the ED7.
I have heard that the ED7 is nice, but out of all of them I like the ED9 and EDR1/EDR2 the best. The ED9 is kind of polarizing though, so it's not for everyone. A lot of people love it, a lot don't. It does have 2 tuning filters, and is easy to mod to make it sound even better. Sue to it's open vents, it has a great soundstage at the expense of isolation and bass. To get monster bass you have to do some mods (close the rear vents, use the gold filter, and replace the foam in the gold filter with fiber fill).
The EDSE has fat juicy bass out of the box, and a nice v shaped tune. But once I heard the EDR1 and EDR2 (which use the exact same housing as the EDSE just a different driver and different vent hole configuration), the EDR1 and EDR2 is much better than the EDSE.
The whole ED line isn't highly resolving or highly detailed either. I classify the ED line as "low-fi heroes". The ZS3 with Slater mod is another option to consider as well. It sounds similar to the EDR1/EDR2, and is sexier looking, and has removable/upgradeable cables.
So rating them in order, for bass/comfort/general performance, I would rate them like this:
1. ZS3 (with Slater mod)
2. EDR1/EDR2
3. ED9 with mods (gold filter)
4. ZS3 (stock ie without Slater mod)
5. EDSE
6. ED9 (stock without mods but using gold filter)
7. ED3
...
100 (ie dead last). ED4
Also, I'm not sure if you have your heart set on the "ED" line, but the ZSE should certainly be another contender on your list. It has excellent bass and a very nice overall balanced tune (good mids, bright and sparkly highs, looks great, dual dynamic drivers, etc).
Hope that helps.
P.S. - It sounds like you are looking for a basshead IEM. In other words, you want skull crushing bass, and you don't mind if it's at the expense of midrange or treble (but obviously you want something that sounds good too). Is that an accurate statement? What's your budget ($5, $10, $20)?