There are quite a few companies offering a full SEO service for less than £100 per month, which might sound like a great deal but there are lots of reasons why spending less on your SEO won't help you in the long run.

Your SEO campaign is a key element in your marketing and ensuring you get a good quality SEO company will ensure you don't loose out in the race for conversions.

1. Full SEO service - optimisation of your website is not a one off job and is not something that can be done just on the landing-page of your website but the whole site. A full SEO service, which will cost you more than £100 a month, will include the ongoing optimisation of all pages on your site, including new pages.
2. Monitoring - a good quality SEO company will regularly monitor your website and it's performance, the keywords that you have selected and make recommendations for any changes that need to be made. Again this optimisation and monitoring is for the whole site and not just your landing-page.
3. Full reporting - some cheap SEO companies just offer overview documents telling you where you are for a keyword at the end of the month. This isn't as helpful as the full reports that a more expensive SEO company will offer. Reports should show where things have gone in the last month, what keywords are driving traffic to your site, what off-page work they have completed for you and as such will give you a full overview of what your website is doing and what is working for your site. They will also be able to track conversions and tell you if a particular page is performing well, or badly in the search engines.
4. A Dedicate campaign manager for your website who you can call whenever you have a question or concern - having a friendly voice on the end of the phone is key to a good SEO company. Your contact will enable you to know what's going on, will discuss changes to the site and it's performance with you and will let you know why things are being done, what the benefits are and help you to understand the SEO process. A good SEO contact will also call you to let you know what is happening on the campaign and to ask if you have any areas you wish to focus the marketing to search engines on.
5. SEO is a specialist service, like a driving instructor or a plumber - you wouldn't go for a cut price service in these things as paying for the qualifications and skills of one of these people guarantees good service. SEO is the same.

So if you are looking for a good SEO company take into account how much time they can spend on your site for the money you are paying.

Remember, your website is part of your marketing team and getting a good SEO company will help this element of your promotion to more people in search engines and help drive more traffic to your site. Choose wisely and see the conversions come to your site.