Payment Modules for Magento PrestaShop OpenCart | TrustCommerce Module for Magento (trustcommerce.com) | Schogini, Inc.
Paystation(paystation.co.nz) Payment Module for Magento. This is uses the single page checkout.
TrustCommerce (trustcommerce.com) Payment Module for Magento. This is uses the single page checkout. The cost is inclusive of setting this up.