I need a professional logo

Information for the business: Specializes in Network Infrastructure. From design to installation
Industry: Technology
Type of logo: Word mark, Emblem
Brand name/slogan in logo: SJA Networks
Number of revisions: Unlimited
Ideas for the visual style: Clean, modern, bold
Preferred colors: Dark Blue/Navy but I'm open to suggestions
Where the design will be used: Website, invoices, Google Apps, Favicon
Extra notes: I would like the logo to have a transparent background so it can look great on anything I use it on.

I would also like the logo to be delivered in multiple sizes so I do not have to resize later.

Below is a list of the sizes and what they will be used for:

Website Theme
- main - 182 x 50 pixels
- main HD - 364 x 100 pixels
- mobile - 140 x 40 pixels
- mobile HD - 280 x 80 pixels
- Bottom - 160 x 21 pixels
- bottom HD - 212 x 42 pixels
- favicon - regular - 16 x 16 px
- favicon - high-DPI - 32 x 32 px

Google Apps - 320 x 132 pixels and no bigger than 30KB
QuickFile Invoices - 450 x 90 pixels

So to summarise the job is to design one logo but profile it in multiple sizes. 10 files in total.

Thanks