When you are getting quotes for a new website there will be some web designers who will offer you a must cheaper solution but be aware that this could be due to cutting corners. Always check if they are building your website in accordance with W3C guidelines and that they will make sure your website displays properly, without errors, across all popular browsers. Also check on their backup strategy because you may need to rely on this in the event of a server failure or hacker attack.
A technically well built website will always perform better in search engines. It may take a bit more time and therefore money to achieve but it will be worth it in the long run. The problem is, to the non-skilled eye two websites can look the same on the screen but can be poles apart in terms of performance and usability.
There is more to good web designing than meets the eye!