VPI HW-9 MK2 vs MK3 vs MK4?

I agree with with Schipo and Braab8.
I went from a Rega to a HW-19
MK ll and loved the difference
right away [using the same arm and cartridge]. Each time I've upgraded I noticed a marked improvement. I now have a MKlV and it's a wonderfull sounding TT. Built like a tank, easy to set-up, upgrade and maintain.
Also with a Rega, you're stuck with a Rega arm [not that it's a bad thing] or an arm with the Rega arm geometry. With the HW-19 you can swap out the arm board for various arms.
You may also want to look into VPI's unsuspended line of tables
[Scouts & Aires]

Many thanks for your thought.
I have Thorens TD145MKii with Grado Gold Prestige.
My upgrade attempt for a new TT has been changed from MMF5/Rega 3 to MMF7/Rega 5, then to VPI HW-19. My budget has been changed from $400 to $900.
According what I heard from my friends and audio forum, MMF5/Rega 3 do not seem to be an enough of upgrade. When I was considering MMF7/Rega5, I looked at some of the forsale ads in audiogon for VPI HW-19 at around $800~$900.
I would not be able to strecth any more from my pocket. Will consider some of MKii or MKiii.

How about clearaudio Emotion? There is one for sale at $950 with Satisfy tonearm and Clearaudio Aurum Classics Satine Wood cartridge. It looks much better (very important to get an approval/complimemt from my wife) than VPI. Would it be as good in sound as its appearance?

Comment regards about 2-19-08 ihcho-----guys how about the common sense factor,after you have been around tt for a good while its like math,1&1is 2 2&2 is 4/ MMF Tables, Project-Rega and alike are like toys compared to a VPI. A19 jr can beat the pants off A mmf7 and its all relative so on down the line. Iam not saying this because iam judging other comments, iam not. The Shadow Knows signed Lamont---