Hi Chris,
Seems your post has sparked a bit of a debate in the web design/development world.
I think we'd be a bit too pricey for you, and probably a bit overkill for what you need but I would like to offer some advice to help you one your way...
Make sure you can update the site yourself, you dont want to be spending money on paying a developer every time you want to make small copy adjustments, ie changing your opening hours etc
£800 for a site is not unreasonable as long as you get the right person/company, look at their portfolio, think long term will, dont go for the cheapest option. There's solutions out there where you can create as many pages as you want, so if you want to expand in the future, a static site would be costly.
Image is always important regardless of your profession in my opinion. A sloppy site gives the appearance of sloppy workmanship, and maybe most people wont be put off, they'll always be a percentage that are.
A gallery of your work may be beneficial, or even a latest news section ie. if you've adjusted some dresses for a wedding and you're able to nab a few pictures to put on your site, with the right site it would only take you a few minutes to do a small write up and add credibility to your business. This all depends on how much competition you have of course, so may seem over the top if you're a small operation in a rural area with little competition, but not so if you're fighting for work in London....
Just a few thoughts. Feel free to contact us for some impartial advice on any proposals you get, as I said, small sites are not our domain, but quite happy to help you through the jungle so to speak
Many Thanks
Tim