I can only agree with the importance of 3D image in Stereo system. The problem is the "subtleties" many amplifier designers choose to offer this result.
Some amplifiers seems more forward because of a bad dynamic control.
Some others offer deep soundstage but poor dynamic.
Naim amps, for example, are quite flat because of their particular dynamic but it's also very "foot taping" kind of amps with an engaging sound. People doesn't care about depth or even notice it because they focus on the fun they get with Naim.
Brand like NVA or Naim are cheaper and give a lot of fun for a small amount of money. All is compromise in Hifi.
I don't know where you can find 3D amp for a small amount of money? I admire your dedication to your customer Bo1972, and if you're able to give the 3D emotional result for the same amount of money, i'll be very interested in the brands you promote?
For me (and i think for many others readers here), the perfect amp combine Micro and macro dynamics, depth and wide soundstage, 3D when you can feel each instruments on the scene, acurate timbre and most of all : EMOTION. I find it with my Music culture combo...for 25000€ (32000$)!
I didn't find many electronics nor cables that fit my requirements of perfection. 3D image, i only here it on High-end (and expensive) products because for me, 3D means the "you are there" kind of feeling, the impression you can turn around the musicians. It's a lot more than depth, a complete new universe. If you can't have the money for that, stay on a fun NVA amp cause it gives this vividness that comes with real music. There is only a few brands capable to give that on the market. There is flaws but, man, so fun and so immediacy!
The last brand that i discovered and surprised me was TSAKIRIDIS Devices. It's a greek company with tube devices. The sound is really engaging and on the neutral side of warm for tube amps. It's really good but not perfect...and cheap.
Perfection doesn't exist in Hifi, at the end, it's just you and the music you love...only your own satisfaction.