BERLIN, Sept 29 (Reuters) - The co-leader of Germany"s Greens said on Wednesday that preliminary talks with the pro-business Free Democrats (FDP) had been good and that the Social Democrats (SPD) were her ecologist party"s preferred partner in any three-way coalition. "We had a good discussion yesterday," Annalena Baerbock told reporters after the talks with the FDP. "The SPD is the election winner after this federal election and therefore it is crucial for us to hold these talks now, but we are talking to all parties," she added.