hi there
website costs vary a lot, there are more and more people offering web and search optimisation services,
the weird thing is they all seem to be able to guarantee top 10 slot on google, well surely they can only sell that to 10 companies.
noboy can guarantee a top 10 listing.
we did our site ourselves, which mean that we can add to it very easily, and whilst i use google adwords, we have a reasonable natural listing, and our line of business does very well, if indeed i had spent say £2k it still would have been money well spent.
you need to decide your busget on a website, which in the end wil come out of your advertsing spend, and then you are in a position to go ahead
regards
martin