I had four of the original T2's and later, in late 2014, I bought two of the T2 Classic's. Basically the same detector, and in 2016 I got a Te Ltd. Special Edition. I didn't care for the preset Iron Audio options, the DST I liked and it did help with a couple of EMI sites, but I mainly liked the bP function for depth in the wide-open old park grassy areas. I got rid of it for one main reason .... it was black. Too many black detectors and I am quite partial to the T2 'green' color. I got the T2+ because it has DST built-in and has the selectable bP ... AND it was green. I sold it when I was thinning out my outfit because I was up to 24 detectors. I missed it, but have a brand new T2+ due to be delivered today. It will stay.
I have liked most detector maker's coil instead of aftermarket coils, as a general rule. But I will try a mid-size NEL coil next spring because I bought the 5X10 solid DD from Teknetics and didn't care for it. heavy and the rod-mount was too far to the rear. As for EMI, I stated that I almost always run my Sensitivity at or near max, with '99' being where all my T2's operated and I didn't have EMI issues. I should clarify that was most of the time I didn't have EMI issues. On occasion I did a little but I could deal with it, or I' often just grab a different detector.
You mentioned the Omega and I used several Omega-8000's and really enjoyed them as my favorite urban Coin Hunting detector. I used the elliptical Concentric coil at first, plus the 5" in trashier places, and then I changed to the 8" round Concentric off a Delta, and on my last two I kept my 5" DD on one and really liked the round 7" Concentric on the other for general use. The one issue I had with every Omega 8000 I owned, regardless of the Version, they were really noisy with the slightest EMI challenge. I had to reduce the Sensitivity a lot with them in most urban sites I hunted. I have an Omega-8500 due to arrive today and it will be interesting to compare it with all the detectors I am going to be evaluating. However, even though I had to deal with the noisy behavior and work them at a well reduced Sensitivity level, it was still a terrific urban Coin & Jewelry Hunting device to put to work.
Monte