When you are planning to have a website it is very much important to go with the CMS that can provide you all the features you require. There are quite a good number of CMS available and everyone has its own plus and minus points. Hence you should go through the features offered by each CMS in detail before settling for something.
When you start searching for a suitable CMS you will come across with many CMS such as Joomla, WordPress, Drupal, Modx etc. Each CMS has its own areas of excellence. You can decide for the most suitable CMS only when you are clear about your requirements. Hence the first step in deciding on a CMS is to understand your requirements properly.
When you are going for e-commerce sites, there are many e-commerce platforms such as Magento, Zen Cart, and Virtue Mart etc. Here also you should first understand your requirements properly and then start your search for a suitable platform.
When you are planning to create a group of your customers or friends and planning to have serious discussions, then it is always better to go for forum software such as V bulletin, PHPBB etc. This effective software will provide you almost all the features you are looking for. Here you should be more specific about the speed rather.
Once you select the CMS you need the next step is to convert your design which is PSD format. There are many service providers in Joomla conversion, PHPBB conversion etc. You can selelct one among them and entrust the work. However, you should examine their expertise and credentials before entrusting the project to them.
When you take the service of a real expert, he can help you in many ways. Apart from Joomla conversion he can incorporate Joomal e commerce, convert existing WordPress site to Joomla etc. An experienced person I this line can help you shaping your requirements too. You may have limited ideas when you are going for a website for the first time, but an experienced developer, who has designed and developed many websites with different requirements can easily find out what all your requirements are based on the nature of your business. Besides, knowing the in and out of the CMS he can be of a great help in future too when you requires some sort of technical support for maintaining or up-gradation of websites.
It will be better to consult an expert before finalizing for a CMS. From your requirements, he can make it out that which CMS will suit you the most. Here all you need to tell is to communicate clearly and effectively with the developer about your requirements.