Best Comparison Shopping Engine?

I'm considering a comparison shopping engine for my advertising needs. I already use Google Base. But I can't figure out if I should start using Nextag, Yahoo Shopping, or Shopzilla? I read an article on practicalecommerce.com that mentioned that Nextag ranks very well in the organic search results for many specific products BUT Nextag is a better comparison site if you're selling electronics. But I'm a retailer of women's fashion accessories! Who would you suggest I go with? If possible, I'd also like to use a comparison search engine that ranks well in organic search results. Which comparison sites would be your top suggestions?

Have you thought of using Google Base? I like because it is free and my SERPs seemed to improve after I uploaded my products. Only problem, you have to redo (or re activate) your products every 30 days.

Get on any shopping engine that requires commission (Amazon, PriceGrabber, and a few others). This way, you will always maintain a constant ROI and it requires little management or worries.

I did work for skincare products (targeting female vanity like you) in the past. In my experience, Shopping.com and NexTag had the best conversion rates. Shopzilla performed the worst.

Yahoo's comparison shopping search engine offers a somewhat superior selection of vendors, extensive product ratings, and reviews. Google's comparison shopping search engine, Froogle, is useful if you want to include eBay listings, search by zip code, or include physical maps of a store.

Both comparison shopping search engines are a bit cumbersome to navigate so sans eBay listings, Yahoo! comes out ahead. Include these two sites in your shopping arsenal, but know better alternatives exist.

it really will depends on your product, but shopping, nextag, and shopzilla are my top 3.