The Classic midplus and the Prestige Tour 660 are two different racquets. The Prestige Tour 660 has the Suspension Grip while the Classic Midplus DOES NOT have the Suspension Grip. The Classic midplus for all intended purposes is the Prestige Classic 660. When Head originally sold the Classic midplus in the U.S.A in 1999 they had lost the rights to the Prestige name to Wilson in the U.S. Market. So Head had to use the Classic mid and Classic midplus names in the U.S.A. for the Prestige Classic. However there was no Prestige Classic 660 in Europe. In 1999 Head had stopped bringing to the U.S. the Prestige Tour 600 (Mid) and Prestige Tour 660 (Midplus). In Europe Head only sold the Prestige Tour 660 with the suspension grip, Prestige Tour 600 with the suspension Grip, and the Prestige Classic 600 with traditional pallets.
I hope I have explained what racquets where sold when and where. If I have confused you please tell me where I have lost you.
Other racquets from Head that are 18x19 string pattern with a 660cm2/102sq.in. headsize that you might like if you can still find them are: The Prestige Master, Graphite Master, the Comp Master, the Graphite Tour 660 (Also Known as the Trisys 270 SAS 660 in the U.S.A), the Pure Competition, the Supreme Competition, and the Extreme Competition.