Which one of these would you use ?

dreamcost
web-shack
zaygo

anyone any experience, especially web-shack , i hear support isn't very good.

really want to integrate worldpay

no experience with above software
most domain providers provide API to intergrate into your site
for a nice complete solution, (includes CP too) try H-Sphere (psoft.net)

Neofree

I am using Dreamcost.
It has gotton me alot of customers, but support is very poor.
Some things do not work.