Looking for good MRP manufacturing software

Looking for good MRP manufacturing software for small 10-15 user manufacturing company. We like the ease of use of QuickBooks Enterprise Manufacturing and Wholesale but it may not provide enough for MRP (materials requirements planning). We are looking at MISYS add-on to QuickBooks to do the MRP part. Has anyone used these programs for manufacturing? Do the two programs integrate well togeter? We can live without routings and machines since we mainly just manufacture simple assemblies, but our purchasing wants MRP and forcasting with suggested purchase orders. We looked at DBA but it is cumbersome, you can't drill down and is non-intuitive.
Thank you,