small business needs a VOIP solution

we are a small business and have been using asterisk for many years. This year we migrated to Cisco UC540 based on someone's recommendation as we had issues with asterisk. this guy couldnt setup IVR that we had been using for last 5 years and decided to marry asterisk with uc540. we continue to have reliability issues. I am looking for someone to give us various options. need someone who is very experienced with cisco voice products and preferably with asterisk as well. successful bidder may get to the implementation as well . this project is for plan only