Magento 1.9 – How to Change Checkout and Cart Messages

Do you really want to add a price for both the simple and configurable? Surely one should add to the other as a default. My advise, just add the one price. Maybe add a 'base price' to the configurable, then for each of the options on the simple products, add an increment if it requires it.

Configurable Base Price: 12.99
Simple Size XL: 0.50
Total Price at Checkout: 13.49

---

Configurable Base Price: 12.99
Simple Size XXL: 1.00
Total Price at Checkout: 13.99

---

Configurable Base Price: 12.99
Simple Size XXXL: 1.50
Total Price at Checkout: 14.49

---

Configurable Base Price: 12.99
Simple Size XXXXL: 2.00
Total Price at Checkout: 14.99

on RWD default/template/checkout/cart/mincart/default.phtml line 158 replace this

            <a href="<?php echo $this->getAjaxDeleteUrl() ?>" title="<?php echo Mage::helper('core')->quoteEscape($this->__('Remove This Item')) ?>"
               data-confirm="<?php echo $this->__('Are you sure you would like to remove this item from the shopping cart?') ?>"
               class="remove">
                <?php echo $this->__('Remove Item') ?>
            </a>

with

            <?php if (strpos(Mage::helper('core/http')->getHttpReferer(), 'checkout/cart') !== false) { ?>
                <a href="<?php echo $this->getDeleteUrl() ?>" title="<?php echo Mage::helper('core')->quoteEscape($this->__('Remove This Item')) ?>" onclick="return confirm('<?php echo Mage::helper('core')->quoteEscape($this->__('Are you sure you would like to remove this item from the shopping cart?'), true) ?>');" class="btn-remove"><?php echo $this->__('Remove This Item') ?></a>
            <?php }else{ ?>
                <a href="<?php echo $this->getAjaxDeleteUrl() ?>" title="<?php echo Mage::helper('core')->quoteEscape($this->__('Remove This Item')) ?>"
                   data-confirm="<?php echo $this->__('Are you sure you would like to remove this item from the shopping cart?') ?>"
                   class="remove">
                    <?php echo $this->__('Remove Item') ?>
                </a>
            <?php } ?>

this will refresh cart page when you delete item from minicart