I started designing my own websites around 14 years ago using dreamweaver then dreamweaver ultradev then MX, which i am still using although i only use the basic functions, i recently had some sites designed in Wordpress which work very well.
My new project is to design around 10 different websites each consisting of around 10-15 pages each site and link them all together to form a powerful collection of sites about my business which is selling scientific equipment.
My question is as far as the search engines are concerned for ranking these websites what should i be designing these site in?
Should i still be using Dreamweaver MX (i havent the time to learn another new program) or should i have them designed in Wordpress (pay someone to build a template)?

Or should i be using another program and spend the time teaching myself how to use ?