Tlh28, I collect turntables and have a variety ranging from high-mass unsuspended to classic 3-point suspensions. Sprung suspension turntables do major on PRAT, which is why I love them. Why restrict yourself to new like the Technodek? Make a major money savings and get yourself a true king of suspended 'tables, an Ariston RD11 (in "S" version as well), once considered the best in the world (usually $200-$300), or a used Linn LP12 for more money. If it's PRAT you want (plus a healthy dose of detail, both being true "high-end" in this sense), then these'll fill your bill without breaking the bank. In fact, owners of the bigger Gyrodecks have been known to defect to these 'tables.
As to why high-mass decks sound "slow", this is belt reaction (stretch and contract), the heavier the platter, the slower the reaction, eventually being heard in the bass frequencies, where rhythm lives, and is consequently destroyed.