I bought my X3 last month, with premium pack and activity pack. The ride is good for me, cornering is awesome as well. I think regular suspension is good enough for me.
But if you currently driving the X5, I think new X3 wont give you any surprise anyway.
X5 interior looks much luxury than X3 as well.
someone said new engine for 06 X3, but some say same engine. Some say keyed bumper optional but some say no. Still dont have any firm answer so far.
2005 X3 2.5 Manual Titanium silver Current
2002 VW Beetle 1.8T Gecko Green Sold
2000 Honda Prelude Silver Totalled
1998 328i Manual Boston Green Sold