No offense dbee, but its like how long is a piece of string, people will give you quotes, but there is no set price.
Your design and development of your site will be based on the constraints you put down, re: asthetics, security, finance etc.
You will always find someone in your budget, but do you know exactly what you want and is this reasonable within your budget.
Re: SEO, that as much depends on your current competition and how long you need to be SEO'd for.
Hope that makes sense.