Magento Functional and Server Expert

We have a number of Magento customers who we host and support. We are looking for someone who can help with providing support for questions, issues, troubleshooting of these customers Magento installations. This could be issues in Magento, functional issues or questions and often server side issues so you need to be very experienced with Linux as well. This would be a long term relationship and you would be the primary point of support for these customers, so we are looking for someone who experienced, speaks English well and is fairly priced.