Which of these seatposts?

[DooDah]

OK, so a LBS has a clearance sale and has various carbon seatposts for sale. All are inline (which is what I am after), but I am not sure which to go for, or what the differences are. They are:

1) FSA carbon seatpost
2) Ritchey Carbon Superlogic seatpost
3) Ritchey Carbon WCS seatpost

What are your thoughts? Thanks

 

[MrWill]

What's the prices?

 

[DooDah]

All the same price 40 quid.