Hi Jenny,
If you haven’t resolved this yet, I’d be happy to help. I just finished doing a bit of customization myself.
The template file used to display the product is “wpsc-single_product.php” and includes a call to do_action( 'wpsc_product_addon_after_descr', wpsc_the_product_id() );
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To change where the Personalization fields are displayed, you can edit your template file and relocate that bit of code.
Check WP Admin > Settings > Store > Presentation and look for “wpsc-single_product.php” in the Advanced Theme Settings box. If it has a check mark next to it, you can edit the file in your active theme’s folder. WP e-Commerce Theme Customization
The other option is to modify the WPEC Personalize plugin and change which action it hooks into. Look for add_action('wpsc_product_addon_after_descr', 'client_echo');
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If this solves your issue, or if you solved it another way, I hope you will consider posting your solution and marking the topic resolved.