The ST4S has been dropped from the 2006 range-at least in America it has so expect that to follow everywhere. The ST3 is virtually as fast, just lacks a bit of top end shove in comparison to a standard ST4S-thankfully mines not standard
With the introduction of the new S4R using the testastretta engine the ST4S was the only bike still using the old 996 lump so was bound to be canned. They sell a lot more ST range bikes in Europe and North America-the UK is mainly sports bike orientated-I won't be parting with my ST4S-to quote one of JHP's mechanics when he test rode it after servicing it 'it's a fecking missile'!
John