Write some Software

I need someone with PHP/Wordpress "plugin" development skills to customize search engine functionality for products on my website. The seller can either select their product details through a step-by-step checkout system or do a 'search'. The website is almost done, however, we can't get the search engine to function properly and to my liking. As for the details: When a seller searches for their phone - i want the search bar to create a drop down with 5 products that match the keyword search. For example if i search "iPhone" - i want the scroll down to show the products in ascending order and the keyword in bold - "Apple iPhone 3GS 8GB", "Apple iPhone 3GS 16GB", "Apple iPhone 3GS 32GB", "Apple iPhone 4 8GB", "Apple iPhone 4 16GB" "etc". The same results would populate for the keyword "Apple" but Apple would be in bold instead of iPhone. This applies to the other phone brands that i have on my website. I also want a "Search More Results for 'Keyword'" on the bottom of search scroll down which would direct the seller to a page that has all the products that match the keyword. Lastly, i don't want the keyword searches to be case sensitive which they seem to be now. I'll provide more details as far as functionality and examples of other sites the would help guide you.