I need a logo and business cards

I am freelancer consultant focused on water efficiency in non-domestic buildings, such as offices and hotels. I have a website already, but need a logo and also business cards.

My website is www.waterenergynexus.co.uk

I need a minimalist logo design, with an environmental aspect. The website should help guide the design.

The logo should be hues of blue or Green and very simple, ideally incorporating the words, Water energy and Nexus in a linked way, as means nexus. Also, the logo should make it clear that my work focuses on the built environment.

The business card should be very simple, and elegant to include my name, qualifications, email, also my twitter account.

The final logo design shall be in a rasta file and PDF.

I would like a around 6 really good logos to choose from with an opportunity for 3 design iterations on the selected design.

I require 50 business cards printed when the design is finalised.