"configure a computer" class/script?

[Brian]

Hello,

I'm looking for a script/class that helps you setup rules and dynamically
configure products (like a computer). This is kinda the "Dell.com" style of
computer shopping.

I've found the following:

http://www.esvon.com/pg/products/p_config/

http://www.x-cart.com/product_configurator.html

Both of these things might do what I need, I just want to make sure I'm not
missing the boat with any other scripts I should review.

Any help is appreciated

--B