I'm not running super-low profile tires (225/50/15s) but I do run them at high pressures (50 PSI) for better wear (Falkens). They should ride really stiff, but I have stock springs with KYB Gas-Adjust shocks up front and KYB GR2 struts in the back. Polyurethane bushings EVERYWHERE and the car rides really nicely. Motion is controlled, but the ride is not harsh, or even firm really, it's just right for me.
I would not be afraid to put poly bushings all around. for your suspension. Unless you need it, I wouldn't, however; do poly/solid engine mounts (Definitely poly or solid cradle mounts though) because then all of your engine vibration will then be transmitted to the driver's compartment. You can offset this by installing Dynamat in the interior, but it's more work. (That's what I ended up doing. It's not bad now, and the car does drive a bit nicer without the engine flopping around back there).
Fresh, new rubber engine/transmission mounts should work well for a stock engine though, they will help limit movement and still isolate the vibrations. A poly dogbone alone won't transmit vibs that bad though (Previous owner had one of those installed on mine, and I couldn't tell that it was that bad).
[This message has been edited by squisher86SE (edited 11-30-2007).]
