Hey Y'all!

So I have a very important job interview with a corporate company (Aetna) on Friday, with the regional sales director.

Now this is my dream job and I want everything to be perfect.

My Question,

How Do I dress?

I'm considering buying a suit for the occasion but I'm unsure if that will overdressed in today's world (as I'm used to the polo/pants combo)

So that is my issue, how should I dress for Corporate? I'm either considering buying a new suit today and having it tailored today or buying a new outfit (Slacks/Tie/Dress Shirt/Belt/Dress Shoes)

Please Help

__________________
The Present:
2014 Audi Q5 TDI Prestige
The Past:
2013 Lexus GS350
2013 VW Golf TDI
2007 BMW X5 4.8i LOADED & Loved
2009 VW Jetta
2008 VW Touareg VR6
2005 BMW X5 3.0i
2005 BMW Z4 3.0i
2004 BMW X5 3.0i
2003 BMW 325i
2000 Ford Explorer Eddie Bauer 4x4