The racquets with the softest touch typically have the:
1) Softest RA flex, which allows for maximum cushioning on impact and dwell time of the ball on the string bed
2) Thinnest beams, which tend to transmit the finest-grained impact feel and manipulation of the ball
3) Certain technologies that assist with shock-absorption in some way, whether they be layup additives, Prince O-Ports or other tech
From Head's lineup, I would look at:
- Prestige Pro (98" 18x20 20mm 58RA)
- Gravity MP (100" 16x20 22mm 59RA)
If you're looking beyond Head, I would look at:
- Bolt racquets (which have a grommet-based suspension system)
- ProKennex Black Ace 300/315
- Prince Phantom 100P / 100X 305 / 100X 18x20
Hope that helps.