Could I please ask what sort of Budget you have & what requirements you are after?
What are you planning to run Forum/Website?
A little more information would help indetermining what we can recommend you.
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Searching the best service provider is like finding the holy grail; as every customers wishes are different, but you could find one which fits your needs. Although as you may have noticed quality between providers differ, from good to bad but also from cheap to expensive. It is well worth to do some research on some companies you think are fitting you and ask questions to them about the things you feel are important.
Webhostingtalk is a great forum to find this information; although this type of questions are often only answered by hosts who are eager of your business. So be careful, take your time and select some hosts you like to do business with and then start doing some searches on the company for i.e. reviews.
Hope this helps you in finding a good provider for your specific needs.