Hi,

Which QuickBooks version are you considering? QuickBooks Enterprise is comparable to ERP software, so you may not have to buy separate ERP software to interface with it.
I don't know much about SAGE; however, I do know of other companies who use it and they are satisfied with it. I think it's scalable, where you buy the modules that you need now and are able to add more later; whereas Quickbooks isn't, you buy everything upfront even if you don't need it. It may still be cheaper in the long run to get Quickbooks.
Hope this helps.