My wife and I were just talking about how her car sounds so bloody good. She has Kaption drivers (Vifa). Tweeter, mids (5.25") and floor pods (6.5").
I went all the way and bought Focal drivers at about 2.5 times the cost. I always seem to enjoy hers more !!!
Vifa drivers are most certainly quality units that are available to us, the consumer, at more than reasonable prices.
Being a speaker builder myself, the one thing I must recommend to you is...brace the hell out of your cabinets. No matter how "solid" you think the cabinets are, they are still resonating and flexing which, without doubt, cancels some of the information reproduced by the drivers. Of course the use of Kimber 4TC or 8TC cabling internally also makes a "huge" improvement in imaging and soundstage size. Please use the best connectors as well. It is a shame when we put so many hours into the construction of the cabinets and the careful selection of drivers, then put a cheap brass/plastic connector into the circuit. Cardas are the best and Vampire will be the best "bang-for-your-buck" !!!
All the best to you !