Advice on Perfect powerful server for large site which will grow

http://www.freshfields.org.uk/

The site above is a large site with lots of images. I need a server that would be powerful enough and have capacity to grow and not lose performance. Currently the site is 3144 MB (although i am sure this can be reduced by optimising). My client likes the company below..

https://hostinguk.net

Could you list for me the most important factors that the server must have to be powerful and have scope to grow and ideally be less than £40 a month. The server we are on currently is starting to feed back 503 errors so this is why we are looking at other options.

:slight_smile: