With Class A amplifiers, your soundstage won't necessarily be "huge". Some Class A amps can add a lot of "depth" because of the thickness and weight of the sound, but they are generally warmer and slower sounding amps. I would look for a really good Class AB amp.
My experience with Class D amps have never been exciting. They can be very neutral and exacting, but they never sound engaging and "huge soundstage" to me.
What is your budget? If you are looking to compare with your VTV, I would say that it may be hard to find a really excellent amp in the $1k range.
Hi-Fi Heaven has a used Music Fidelity M6s PRX amp for $2099. I'm sure there are others.
Odyssey Audio has really good Class AB amplifiers. (no trigger input for auto-turn on, though).