regarding the designer, if you are just starting out and can't afford one...borrow concepts from your competitors. If you are selling shoes, borrow the design from zappos. Why? Because you know that they've optimized every single thing, since even .5% can cost them millions.
I'm pretty sure that quote is from pg.
And if you want to be a real jackass, you can add an exit pop to your site.
The call to action thing is very important. Most users are very uncertain, if you give them too many options, they'll get confused and won't do anything.
As far as social proof, yes I agree, but it's not that hard to fake the social proof. Nothing is stopping you from adding a Techcrunch image to your site. And if techcrunch bitches...just point them to that completely unrelated comment you made with a link to your site.
overall good post, since I find that pretty much every website will have one of those missing.