True that a wall mount will work extremely well. No doubt about that! It is indeed the second best way to isolate turntables. That said, wall mounts are still receptive to vibration, specially if your speakers are rear ported and placed too close to the back wall. If you really want to reduce resonance to a whole new level, the sandbox is the way to go. Hear it for yourself and, most likely, you will agree.
The VPI HW19 is an amazing table simply because of the way it was built. No parts spared here! Sadly, I cannot share the same excitement with their newer products. I have owned both the HW19 and the Scout and the HW19 sounded much better (to my ears) with an RB250 at half the cost. If you can find a decent HW19/RB250, go for it. Otherwise, $895.00 for a brand new Rega RP3 will provide you with years of happiness, not to mention the fact that there is an upgradable path that will bring this TT to even higher grounds. Just my honest opinion.