Google checkout is nice but requires SSL (if you dont already have it). It also only charges 2.9% +$0.30. 2checkout is expensive 5.5% +$0.45
I would also like to hear why you don't like Paypal. There is much more to choosing a payment processor than just shouting this name and that name. Other factors which you need to consider are: => type of product/service you want to sell => your country (for withdrawals) => type of withdrawal methods offered => accessibility of support! sooner or later you'll need to contact them => brand (is it well known or not) => reviews Imho Google Checkout never got off the ground and I don't think Google is promoting it as well as they could/or at all? Google Checkout is tedious to implement and we've read many complaints about them being not contactable (although I cannot confirm this). Do a search of each before you decide. You seem quite clued up on payment systems duperhost. Will PM you later.
I am currently using 2checkout for Visual Website Optimizer and didn't have many problems. Though their transactions fees are bit on the higher side.