Essentially, I'm looking to do the following:

• Enter a whole bunch of items

• When items match a search (even better if there's a system where you can narrow down choices by features - à la bestbuy.com), thumbnail images (at minimum) come up.

Any help would be much appreciated! Bonus points if it can do things like limit the amount of items you can "compare"!

I found this page on templatemonster.com.

It appears to be guidelines on managing a website module that allows users to call up and compare products from within your site. Is this along the lines of what you're looking for?

http://www.templatemonster.com/help/zencart-how-to-manage-products-compare-module.html

Here's another: http://www.hotscripts.com...assifieds/

Here is an add-on for OSmerchant called "compare products": http://addons.oscommerce.com/info/8114

P.S. I can recommend TemplateMonster; I've purchased website templates from them before and they have great products and good support.