I want a 3 slide banner for my supplement website

Design details: I need a stretched across the top of my website which is three different banners on a slider so each one slides over at a time.
I am wanting it ASAP and to really show fitness / supplements etc. We stock a lot of the major manufacturers products along with cheaper alternatives.
To get an idea I want the 3 pictures removing from my site and replacing with a thinner banner so it does not cover as much of the page. Must look professional to give the visitor trust in the site. my site is nutritionsupermarket.co.uk for research.
Banner sizes: I am open to the size to fit the page and need advice on this
Ideas for the visual style: Must look sporty / fitness / strength
Things to avoid: Tacky and cheap
Preferred colors: Very open but bold interesting scheme
Website url: www.nutritionsupermarket.co.uk
Website information: we sell fitness supplements
Extra notes: We are aiming to target mainly prohormones and fatburners on our site with just a few protein powders / other types