By setback, do you mean a post with an offset head, or a true layback post like the Thomson layback ? --

For something as important as a seatpost , i'd bite the bullet and get a Thomson, but thats me --- the only setback one i a m aware of though is the layback post


The post on my bike has quite a bit of setback -- enough that i run the seat forward -- i could really use a Thomson zero offset myself -- but its a good quality Easton post , (either an EA 50 or EA 70 , i dont know which ) -- if i had the seat in the middle of the adjustment range , it would really be back there for my tastes (longer legs than arms )

I dont know what the post cost now - but an Easton alloy post wasn't a lot of money when i built my bike a few years back