Hmm, it would be hard to compile one since each server has varying equipment. Could you specify which server you are currently playing on? Would make it simpler, as for the highest happiness, this items would be the New Venus Wings and the F-14 Tomcat(both at +1000 happiness).
in addition to new venus wings and tomcat which are both 1000 happiness 3rd equipment. also there are some 3rd equipments with 600 happiness like irish chopper, different mounts, rainbow wings etc.. ps. higher happiness gives u more stats on workout. :)>-
@buckheep - use a 600 happiness item until you complete Double Happiness from Luxury item class under science. Wont make much difference unless you going to train with loads of gold or checks.