I haven't used PeachTree myself, but here is a review of it.
http://www.smallbusinesscomputing.co...le.php/3367511

Depending how on tightly you want to tie in your e-commerce operation with your accounting package, you may want to take a look at NetSuite. It's a Web-based app, so you'd how to be comfortable with that type of hosted product.
http://www.smallbusinesscomputing.co...le.php/3405611
--Dan