I would advise you to go for the ETP, not because I live in Europe, but because it is a very good detector, in fact the best ratio Fun/pleasure/Finds for the spent dollars.
Yes, the ETP can be bought with the 11"DD coil. And yes, the 5"DD coil should be your next purchase. It turns the already excellent iron trash behaviour of the ETP into a miracle-work-in-the-dirt machine, and is still cheaper than the Omega.
If you hunted for years with a fixed GB detector without noticeable problems, then you won't have any with the ETP.
Now, if you want to upgrade later to an Omega, just buy a version with a concentric coil and...you will be able to swap coils.
I bought the ETP with the 8" Cc coil, and use it with my Golbug Pro's 5"DD and 11"DD coils.
That's another BIG advantage.
HH
Grumpy