specialized pave seatpost- carbon with zertz damping. 40 quid on www.wiggle.co.uk
It's got pedigree- i think it's used on the 3,600 pound Specialized S-Works Range. Plus, it looks gorgeous.
Saddle- probably a specialized toupe, selle italia SLR or a fizik arione. All are race proven and between 40-90 quid.