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.
Do I have to spend $4000 plus to get a better sounding speaker than GET model 7 ?
I have owned a pair of Golden Ear Technology 7's speaker for almost 3 years. I think they sound very good in my current set-up. I bought them unheard based on the rave reviews they received at CES 2012. My concern is that if I was to invest in a speaker that is $3500-$4000, it may prove to be only marginally or fairly better. I am not saying that the GET's 7's are the best bargain in audio at $1395. My experience with them is they are very accurate with low distortion, but don't throw a particularly wide or deep soundstage.
I have considered( not necessarily auditioned) Revel F-206; Focal Aria 936; Paradign F85; PSB T-2'; Ryan 630; B&W CM9S Dynaudio X-34; Duevel "Venus" Audio Physic Sitara 25 and Tempo 25 All of the indicated speakers (except AP and Duevel) fall in the $3000-$4500 retail price range
ProAc floor standers are off the scope in price, (often, even used) Anything I buy will be used, because California sales tax is 8.5%, and I can stretch my dollars buying used.
Any recommendations are welcomed especially if based on you own experience with a particular speaker or brand.
Thank you, S.J