In general at $4.99 a month hosting plan isn't going to have enough muscle to run your Dolphin site with too many members - and you likely will have trouble with Orca and Ray extensions.
A private or VPS is preferred for getting the most out of Dolphin's many amazing features.

However, if you are running a small site without a lot of traffic I highly recommend HostUpon - their prices are excellent, you can scale up as you need to (as your site and ad revenue grows) and their support is amazing. see more I submitted a support ticket and had the complete answer in less than 4 minutes!!

Best bet is to contact a prospective host before hand and talk to their technical support to ensure that what you want to do with your Dolphin site will work with the package that you want to buy off them.