Sage MAS 200 and Salesforce.com Integration

I am assessing 'build or buy' regarding integrating Salesforce.com Enterprise Edition with a Sage MAS 200 accounting system, version 4.3. These are the particulars of the project: 1. Two-way integration 2. Standard and Custom salesforce.com objects will send/receive data from MAS 200 There are pre-built cloud-based applications such as Interweave and eBridge Connections that work nicely for this, but I want to also assess building it. Please do not crowd my inbox if you do NOT have experience integrating MAS 200 with salesforce.com. That is the ONLY qualification I am interested in. If you have this particular experience, I'll then discuss the project with anyone that responds to this.