We have created this post on how to make your Call to Action buttons stand out on your website or app. Take a look it may offer some helpful tips.

 

If anyone has feedback it would also be appreciated:

 

 

http://www.zeta.net/best-practices-for-buttons-in-ui-design/

My one point would be careful with words like 'Now' ... some people find these sorts of demands off-putting, like they're being ordered to do something rather than chose to do it.

And your comments on colour are far too simplistic. There are a number of studies that show red can be a better option for a cta button. It all depends on context, dominant colours, who you are targeting and for what.

Nice stuff, thanks!