I also really like your nav bar, Im edging towards the colour white as your background instead of grey, may make your writing stand out a little better.
You've done very well with the Google ad positioning it nearly straight in-line with your paragraphs so your visitor will feel more intrigued to press it.
Personally I prefer your header without caps letters in it, it makes it look more unique and professional.
The only thing I would say is that your images in your banner might need to be cut a little better, did you use the lasso tool or the magic wand tool to cut out your images?
Overall your site is very good looking and sleek so keep it up buddy!