Do I have to spend $4000 plus to get a better sounding speaker than GET model 7 ?

I think the Focal 936 is a better speaker which is why I own a pair instead of GE's. I think it looks better, is better built, and sounds better. If you don't want or need the muscular bass response of the 936, try the 926. The 936 wouldn't be a marginal improvement over the 7's in my opinion. It would be major, especially if you've got quality equipment to drive them. Unlike GE's, the 936's will reward you for using the best gear you can afford. I built a Pass F5 for mine and it's taken them new places. I think even the Focal 726 would be an improvement. 

Why not move up in the GE line?

I love my ProAc Studio 148 floor standers, which were just over $3000 and use the same tweeter as the Response line.  Too bad they stopped making them.  ProAc Studio 140 mkI are the same speaker without the phase plug.

4K will get you better assuming your electronics are up to it. Moving up the food chain in speakers doesn't do much unless you can feed them properly. This is not to say you need to spend mega bucks, just that a home theater receiver is not gonna get you there. Obviously I don't know what you have because you haven't mentioned it. 

Yes, you can get better -  including in the GET line: the Triton 3+ for $2500 or the Triton 2+ for $3500. Assuming your front end and amplification are up to it, either of these GET speakers will give you everything you like about your present ones but much more, + better bass, transparency etc plus great soundstaging. And they're easy to drive. I still wonder about you room set up since you found your 7s edgy at one point, something they definitely were not when I heard them. The $3k-5k range is crowded with good speakers.

Twoleftears: "Different strokes for different folks. I heard the GE 2's against B&W CM10's a while ago, and there was no comparison for me. B&W much greater truth-to-timbre on acoustic instruments. GE's sounded like (good) HT speakers to me. More recently, in another shop, I heard the B&W's against other brands, and preferred Harbeth, Sonus Faber, and Paradigm (Persona) over the B&W's. YMMV."

Different strokes indeed. We auditioned all the  speaker brands on your list and seriously considered the CM10s, but chose the GoldenEar Triton 2+ as the most musically satisfying over all and biggest bang for our particular buck - especially for the large scale classical music we primarily listen to. The spousal unit is a classical musician, I'm a former choral singer and organist. I think the Tritons would be killer in a HT application but we are totally uninterested in that. We fell in love with them because Reiner and the CSO sounded fab through them. We actually auditioned the GET speakers last because we had a home theater prejudice against the Tritons - an article by a dealer who loves classical persuaded us to give them a try. BTW, I have not heard the original 2s, only the "+" version.

Different strokes and all that.